Changes to speed up definition and use of specialized unification.
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allowed *=> in syntax, but not in compilation
Fixed bug with the %S format.
small fixes
Inserted ground checks before tnot's in inheritance.
Made flora_switch dynamic.
Made copy_flrfile much more efficient through the use of print_file_contents/1.
Moved file_print_contents to file_io from x_interp, since it is used elsewhere.
Some changes after a new option --enable-slg-wam is added.
