Remove leftover function prototype.

The prototype for inval_twophase_postcommit wasn't removed when it's definition
was removed in efc16ea520679d713d98a2c7bf1453c4ff7b91ec / the initial HS commit.

Andres Freund
psql: honor 'footer' option for expanded output

"No rows" previously only honored the tuples-only option.

Per report from Eli Mesika
psql: fix \copy stdin trailing space requirement

Previously a trailing space was required for \copy ... stdin:

	copy foo from stdin ;

Etsuro Fujita
Add comment for VARSIZE_ANY_EXHDR macro

Gurjeet Singh
docs:  Update libpq and testlo examples

Josh Kupershmidt
fuzzystrmatch: replace broken link in C comment

Albe Laurenz