pgsql: Convert psql's tab completion for backslash commands to the new

Convert psql's tab completion for backslash commands to the new style.

This requires adding some more infrastructure to handle both case-sensitive
and case-insensitive matching, as well as the ability to match a prefix of
a previous word. So it ends up being about a wash line-count-wise, but
it's just as big a readability win here as in the SQL tab completion rules.

Michael Paquier, some adjustments by me

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4f18010af126f126824e01eec2285e6263d98b3d

Modified Files
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src/bin/psql/tab-complete.c | 333 ++++++++++++++++++++++---------------------
1 file changed, 173 insertions(+), 160 deletions(-)

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