pgsql: Make SET synchronous to avoid surprises with subsequent queries.
pgsql: Simplify regexps, add docs.
pgsql: Case insensitive regexps, but more readable.
Allow hash_messages to be called multiple times.
pgsql: Make better use of the Stdio.Buffer add/add_ints API.
pgsql: FETCH is eligible for parallelisation too.
Compiler: Added #pragma {,no}disassemble.

When debugging the compiler it is is often useful to get
disassembly output for just a few functions in a specific
file. This pragma causes the compiler backend to dump the
result from the peep-hole optimizer to stderr for functions
defined in sections where #pragma disassemble is active.

Note that the pragma currently only has effect if pike
has been compiled --with-rtldebug (aka PIKE_DEBUG).
Stdio.Buffer: LFUN::_sprintf() must not have side effects!

sprintf("%s", buf) and sprintf("%q", buf) had the side effect
of emptying the buffer (which is not what you expect when you
use them for debug output...).