Add some references, most of these were removed when we stopped building
and installing USD/SMM/PSD docs.

jmc@ agrees with the direction, ok millert@ on an earlier diff

More Version 1 AT&T UNIX history.
This became possible because copies of the original v1 manuals
have shown up on the Internet some time ago.
Reminded by Sevan Janiyan <venture37 at geeklan dot co do

More Version 1 AT&T UNIX history.
This became possible because copies of the original v1 manuals
have shown up on the Internet some time ago.
Reminded by Sevan Janiyan <venture37 at geeklan dot co dot uk>.

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make 0Z do what the original dc and gnu bcc do; ok tom@

Add a caveat wrt use of non-decimal fractional notation; from kshe; ok jmc@

document that the 'e' command is non-portable; from kshe; ok jmc@

Introduce e command, equivalent to p, but writes to stderr

replace all references to bn(3) with BN_new(3),
and make sure all BN*(3) pages point back to BN_new(3)

delete documentation for ! command

Stefan Unterweger pointed out that, contrary to the man page,
dc exited after processing any expressions and/or files;

this is the doc fix, as requested by (and ok) otto

more usd/psd stuff lurking...

more wacky macro fixing;

The .Os macro is not optional. Even with groff(1),
forgetting it lets the footer line look incomplete and unbalanced.
Markup error found by mandoc(1), also required to fix the mandoc build.
ok jmc@

The .Os macro is not optional. Even with groff(1),
forgetting it lets the footer line look incomplete and unbalanced.
Markup error found by mandoc(1), also required to fix the mandoc build.
ok jmc@ sobrado@

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convert to new .Dd format;

put `I' in the right place; from Igor Sobrado

Typo. ok otto@

deploy .An -nosplit; ok jmc

Implement command line evaluation of expressions by implementing the -e option.
ok weingart@

Allow for more registers using a 2 byte index. This feature is
enabled by supplying the -x option on the command line. Allows long
variable names in bc(1) (to appear soon). If no -x option is given,

Allow for more registers using a 2 byte index. This feature is
enabled by supplying the -x option on the command line. Allows long
variable names in bc(1) (to appear soon). If no -x option is given,
behave exactly as before.

ok jmc@

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A basic stack operation that is missing from the original dc (and
GNU dc as well): drop ('R').

Implement new boolean operations 'N' (not), 'G' (equals), '(' (less)
and '{' (less or equal). These operations push their result back
to the stack. Used by soon to appear boolean operations in bc(1).

Implement new boolean operations 'N' (not), 'G' (equals), '(' (less)
and '{' (less or equal). These operations push their result back
to the stack. Used by soon to appear boolean operations in bc(1).

man page tweaks and ok jmc@

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Describe non-portable extension # (comment), n (print w/o newline),
and a (byte to char).

Tweaks and ok jmc@

Duh, a stack machine without swap; implement GNU compatible 'r'
(swap) operator. Prompted by Michael Knudsen <e at molioner dot dk>

quote args to make them expand properly;

Document new extended comparison operators.

ok jmc@

typos from Jared Yanovich;