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is_loaded/1 predicate in consult, to allow enumerating all loaded files (including into usermod)

New xwams generated by updated compiler. (Gensym numbers changed.
SHould be no functionality changes.)

Fixed bug in compiler, in which it assumed it could start gensym-ming
at 300 and all would be OK. Of course, it's not always. So now ensures
that gensym is larger than any variable genned during clause generation.
And this changes most xwam's, it seems, since gensymmed ids are now
different.

added a version of storage_find_fact/3, which returns the actual stored
fact, not just the result of unification

Made concat_atom run in either direction. I.e., can be used to split atoms.

Added comment to remember to fix something wrt char-sets at some point.
Added defined constant where a constant was used (twice) for clarity.

Fixed path_sysop(cwd_ancestordir,..) to always return directory with trailing
slash.