reduce the man(7) global indentation from 7n to 5n, see man_term.c rev. 1.197

Vertical spacing changes around tables in man_term.c rev. 1.194
and tbl_term.c rev. 1.66 cause quite a bit of churn, unfortunately.
This commit cleans up most of it.

delete the two pairs of extra blank lines from expected man(7) terminal
output that are no longer printed since man_term.c rev. 1.189

The GNU tbl(1) program contained in the groff package internally
uses roff(7) tabulator settings to implement tables, and it used
to leak the changed tabulator settings from tables to the subsequent

The GNU tbl(1) program contained in the groff package internally
uses roff(7) tabulator settings to implement tables, and it used
to leak the changed tabulator settings from tables to the subsequent
roff(7) code. In mandoc/tbl_term.c rev. 1.42 (June 17, 2017), code
was added to be bug-compatible with groff.

In commit d0e03cf6 (Oct 20, 2020), GNU tbl(1) changed behaviour
to save the tabulator settings before starting a table and restore
them afterwards. Adjust mandoc for compatibility.

Since mandoc implements tables without using roff(7) tabulator
settings, saving and restoring tabulator settings is not needed in
mandoc. Simply deleting the code that changed tabulator settings
by reverting tbl_term.c rev. 1.42 is sufficient in mandoc.
Also adjust the desired output of the regression tests
to match the new behaviour of both groff and mandoc.

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Ignore unreasonably large spacing modifiers in tbl layouts.

Jan Schreiber <jes at posteo dot de> ran afl on mandoc and it turned
out mandoc tried to use spacing modifiers so large that they would
tr

Ignore unreasonably large spacing modifiers in tbl layouts.

Jan Schreiber <jes at posteo dot de> ran afl on mandoc and it turned
out mandoc tried to use spacing modifiers so large that they would
trigger assertion failures in term_ascii.c, function locale_advance().

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