XSB Src (SVN)-old

Fixed typo in an error message.

Fixed indexing and dynamic bugs in load_forest_log.

Changed itereated testsuite for SVN.

Add support for using .prolog as a source file extension. May not be complete.

Updated the multi-threading tests for the changes to the thread_sleep/1 predicate.

added flag_defs_xsb.h

made the dreaded Exiting XSB abnormally appear as a runtime error rather than a
feedback message

Fixed thread_sleep/1 to accept seconds as per draft standardization proposal. Changed handling of the at_exit/1 thread handler so that its success, failure, or error doesn't affect the thread exit status. Fixed bug in handling exceptions resulting from thread cancellation using a throw/1 signal.

changed xsb_mesg->xsb_error in several places where the messages are errors.
In xsb_mesg, took into account the --quietload flag.
Eliminated tons of gcc warnings on linux

fixed a few typos