XSB Src (SVN)-old

Added option to read_term/2/3 of 'variables_as_atoms', which returns a term with its variables bound to their names; i.e., it treats variable names as constants. Useful for reading prolog-like terms from other systems.

removed extra :-module from swi

enable configuration of dbdrivers by default.
--with-no-dbdrivers disables that.

all makexsb's now run xsb for the first time to create xsb config.xwam
recompiled dlls for windoze

Replaced old low-level predicates (psc_*-type) with more standard ones.

ported library apply from SWI and nth0/3,4 nth1/3,4

changed intern_term to throw errors instead of fail.

Add mode declarations, and some minor checks, to ensure that all syslib file pass groundedness mode checking.

Added new hook calls to support intercepting assert and retractall.

Added new hooks: xsb_intercept_assert_hook and xsb_intercept_retractall_hook, to allow asserts and retractalls to be replaced (mostly so e.g. assert(p(a)) can be turned into assert(p_int(a)).