Increase the -man -Tascii text width from 65 to 78 characters

in both our old in-tree groff and in mandoc, because
1) It looks and reads better.
2) It agrees with both bsd.lv mandoc and with modern groff.
The tmac.an part was done by millert@, with a minor fix by me.

While touching our old groff, switch off hyphenation, suggested a long
time ago by millert@.  It helps searching and comparisons.

While touching mandoc terminal_man(), explicitely initialize the
tabwidth - not strictly required, but easier to understand
and more robust, also suggested by millert@.

General mumbling of agreement by many,
including millert@ deraadt@ jmc@ sobrado@ ...

Remaining problem:
Setting the title length (.lt) has no effect for me,
but we can fix this in tree in case anybody figures it out.

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