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.

At the end of every tbl(7) cell, clear the \z state.
This is needed because the TERMP_MULTICOL mode is designed such
that term_tbl() buffers all the cells of the table row before the
normal reset log

At the end of every tbl(7) cell, clear the \z state.
This is needed because the TERMP_MULTICOL mode is designed such
that term_tbl() buffers all the cells of the table row before the
normal reset logic near the end of term_flushln() can be reached.

This fixes an assertion failure triggered by \z near the end
of a table cell, found by tb@ using afl(1).

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