mg: allow to change the tab width

This makes the tab width customizable per-buffer. The new function
`set-tab-width' changes it for the current buffer or the default value
for new buffers if called

mg: allow to change the tab width

This makes the tab width customizable per-buffer. The new function
`set-tab-width' changes it for the current buffer or the default value
for new buffers if called with a prefix argument (or from the startup
file.)

The default tab width is still 8 column.

Together with the newly resurrected no-tab-mode, allows to use mg for a
variety of programming languages and coding styles.

Note that it's not possible to call set-tab-width with auto-execute in
the startup file due to limitations in how auto-execute and the parser
work.

ok tb@

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resurrect mg' no-tab-mode

It's a mode that makes mg insert spaces up to the next tab stop upon
pressing TAB, along with the various tweaks needed in other places so
for e.g. auto-indent-mode also us

resurrect mg' no-tab-mode

It's a mode that makes mg insert spaces up to the next tab stop upon
pressing TAB, along with the various tweaks needed in other places so
for e.g. auto-indent-mode also uses spaces.

This is not just an unifdef NOTAB: even under no-tab-mode mg should
consider literal TAB characters wide up to the next tab stop, while the
hidden code considered hard tabs to be just control character (i.e. ^I)
with width of two columns. I'm also introducing the helper function
doindent() in utils.c to de-obfuscate the insertion of tabs/spaces until
the given column.

ok tb@

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Delete obsolete /* ARGSUSED */ lint comments.

ok miod@ millert@

fix undo in transpose-paragraph.

If you have a paragraph:

123
456

With the cursor on either the 4, 5 or 6 and no newline after the '6',
and then execute forward-paragraph (M-}), the cursor sits still and
does not move to the end o

If you have a paragraph:

123
456

With the cursor on either the 4, 5 or 6 and no newline after the '6',
and then execute forward-paragraph (M-}), the cursor sits still and
does not move to the end of the second line (after the 6), which is in
effect the end of parapraph. This diff fixes that behaviour.

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Add 'sentence-end-double-space'.

If you prefer "lighter" punctuation and one space between sentences,
for example:

Mr and Mrs Jones are from the UK. They arrived today.

over more liberal use of fu

Add 'sentence-end-double-space'.

If you prefer "lighter" punctuation and one space between sentences,
for example:

Mr and Mrs Jones are from the UK. They arrived today.

over more liberal use of full stops and double spaces between
sentences:

Mr. and Mrs. Jones are from the U.K. They arrived today.

then toggling 'sentence-end-double-space' will make mg's
fill-paragraph function format text using one space instead of two
(the default) between sentences. However, be careful, should you have
a double spaced document and accidentally "format" it to have single
spaces, then you may have a problem. mg won't be able to revert the
formatting for you (unless you have a previous version of the text in
the "undo" history, or are using mg's backup facility and haven't
opened and saved multiple times!).

Comments from schwarze@

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Stop mg putting a space at the end of a paragraph when using
fill-paragraph. Reported by Harald Dunkel.

s/begining/beginning/g

Make functions that accept multiple iterations via C-u N, honour 0.
Except C-k which has a defined behaviour. In mg, C-t doesn't complete
n iterations if requested, but probably should, hence it has

Make functions that accept multiple iterations via C-u N, honour 0.
Except C-k which has a defined behaviour. In mg, C-t doesn't complete
n iterations if requested, but probably should, hence it has been
included in this diff.

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Add transpose-paragraphs. ok jasper@

Make comments more accurate.

Add mark-paragraph. ok jasper@

Fix multiple iterations of kill-paragraph. ok jasper@

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly so

Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

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Stop using <sys/param.h>; replace MAXPATHLEN with PATH_MAX, stop using MAX(),
and pull in <limits.h> for *_MAX constants.

inspired on a diff from Kamil Rytarowski (n54 (at) gmx.com)
ok bcallah@

If gotoeop() is called requiring more than one iteration, it behaves
oddly if it reaches the end of buffer before completing all
iterations. This diff makes the kill-paragraph and forward-paragraph
c

If gotoeop() is called requiring more than one iteration, it behaves
oddly if it reaches the end of buffer before completing all
iterations. This diff makes the kill-paragraph and forward-paragraph
commands stop once they can go no further. ok florian@

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gotoeop() does not behave as expected when there is no '\n' at the end of the
buffer. ok florian@

Fix a bug in backward-paragraph. If the cursor is on the first line of
a paragraph, it jumps to the start of the previous paragraph if you
press M-{. Input and fix to my diff from florian@

Don't use nospace uninitialized in gotobop and gotoeop.
Problem noticed and diff from bcallah@.
Slightly different fix by me.
OK lum@, bcallah@

Add some missing dobeeps.
ok florian@

Move upwards passed multiple lines with no characters instead of
stopping when first line with no characters is found.

Make 'kill-paragraph' behave like emacs. ok florian@

Update the forw/backpara comments to reflect recent changes.

tidy-up int declarations as suggested by florian@

Adjust M-} (forward-paragraph) to behave like emacs.
Bug fix and ok florian@