Make a LOT of fixes to syscat.source to:

* Set search_path properly (and reset it)
* Add schema name to all results
* Add schema name to ORDER BY first
* Make checks for user-defined objects match reality
* format_type all type names
* Respect attisdropped
* Change !~ to 'not like' since it's more standard


Christopher Kings-Lynne

> * Change LIMIT/OFFSET to use int8

Oliver Elphick

Hiroshi Saito

> * 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.