XSB Src (SVN)-old

Changed db_retract_abol to pass prref instead of a buffer pointer
obtained from the prref. Eliminates a use of buff_word, always a good
idea.

Minor changes to good release notes for 2.3

instructions for web site maintenance

* update of release notes (for review)

* new release name

* ifdef'd out unused function which uses localtime(). Some versions of
glibc define localtime() in sys/time.h, others in time.h, and this is
currently not detected.

Added a predicate write_canonical_lettervar/1 to write variables in
number-varred terms as A,B,C...

* solves problem of calls to get_lastnode_cs_retskel/4 from inside
findall, which weren't being inlined as they must (to avoid GC).

Fixed bug in test_heap: before always doubled space when more space is
needed; now gets what's asked for if it's greater than the doubling.

Took out a debugging printout left in by mistake.