Add m68k to linux port.

0.0/0.0.  That option appears to affect the regression test result as well.
The compiler documentation doesn't recommend -O4 for universal use, so
let's stick to the conservative -O (== -O2) by default.

option -fno-strict-aliasing is available.

< 	o Queries across databases or servers (two-phase commit) [2phase]
> 	o Queries across databases or servers (two-phase commit)

> 	o Queries across databases or servers (two-phase commit) [2phase]

gcc.  Per comment from original author, Brian Gallew:
"Ancient history.  Kill it fast."

language handler to the 'Internals' area, per my proposal of yesterday.
Clean up the trigger documentation a bit.  Push SPI chapter to the end
of its part, and reorder the Internals chapters into what seems a more
sensible order (at the moment anyway).