> * Allow more ISOLATION LEVELS to be accepted, but issue a warning for them

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.

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

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