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Delete the obsolete versions of the all-solutions predicates from std_util.m.
(Normally we would wait until after the 0.13 release, but we don't want them
in the next g12 release of Mercury which is why they are being deleted now.)
Document some parts of the library that are handled as special cases by the
compiler and the declarative debugger.
library/std_util.m:
Delete the obsolete versions of the all-solutions predicates from
this module.
library/solutions.m:
Mention that these predicates are handled as a special case
in browser/declarative_tree.m:
Reformat a descriptive comment so that the library reference manual
doesn't have a line that exceeds 80 characters in length.
library/builtin.m:
Mention that cc_multi_equal is handled as a special case in
browser/declarative_tree.m.
Mention that dynamic_cast/2 is handled as a special case in
compiler/const_prop.m.
tests/*/*.m:
Import solutions where necessary.