pgsql: Further tweaking of print_aligned_vertical().

Further tweaking of print_aligned_vertical().

Don't force the data width to extend all the way to the right margin if it
doesn't need to. This reverts the behavior in non-wrapping cases to be
what it was in 9.4. Also, make the logic that ensures the data line width
is at least equal to the record-header line width a little less obscure.

In passing, avoid possible calculation of log10(0). Probably that's
harmless, given the lack of field complaints, but it seems risky:
conversion of NaN to an integer isn't well defined.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/181346cf9892820c94f51525d2c38684148812bf

Modified Files
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src/bin/psql/print.c | 56 ++++++++++++++++++++++--------------
src/test/regress/expected/psql.out | 40 +++++++++++++-------------
2 files changed, 55 insertions(+), 41 deletions(-)