XSB Src (SVN)-old

Adding a few more tests of dynamic loading with modules along with dynamic loading of
trie indexed coded.

Revision of dynamic loading section to include load_dyn_gen/2.
(Please help me with a better name).
The various options for this predicate are explained, while the various incarnations of
load_dyn and load_dync are explained in terms of option choice for load_dyn_gen
(again, better name?). Even though load_dyn_gen (name?) is implemented just a fancy switch
to load_dyn(c) I think the explanation is now simpler and clearer.

As part of the manual revision I updated the discussion of static vs. dynamic code
in the System chapter, and added a discussion of canonical syntax in the Syntax chapter.

Making ensure_loaded/3 standard.

Removed obsolete FactFlg in load_dync. Also put all constants in usermod in load_dyn(c) (even if standard_symbols).

Fixed some uses of incorrect defined constants: tag instead of token constants. (Note didn't change .xwam).

Test for changes to load_dyn/c but also
adding more tests for these loaders overall.

Changes and extensions to load_dyn(c).
* Added load_dyn_gen/2 which allows the user to make a call via an option list.
* Changed a warning about too many non-canonical terms in load_dync to a syntax error.
* Made the number of non-canonical terms encountered before throwing an error settable via a prolog flag.

The change to curr_sym is to add a syntax_error/2 (there was only a syntax_error/1).

added a new flag for an adjustable error limit for load_dync.

Declared decode_index/2 exported in curr_sym and commented back in an index decl in file_op.H (and commiting consult.xwam that seemed out of sync).

Just a little cleanup that I forgot to do.