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Add options to configure that allow the user to specify the set of library
grades to be installed more precisely.
configure.in:
Add an option --enable-libgrade=<gradelist> that specifies
the list of library grades precisely.
Add an option, --disable-most-grades, that reduces the installed
grades to a "minimum" level for developers (asm_fast.gc,
asm_fast.gc.debug.tr and hlc.gc), since this is useful to minimize
installation time e.g. when installing a release of the day on a
laptop.
Add an option, --disable-nogc-grades, that prevents the installation
of grades without garbage collection.
Add an option, --disable-prof-grades, that prevents the installation
of profiling grades.
Add an option, --disable-trail-grades, that prevents the installation
of trailing grades.
Add an option, --disable-pair-grades, that prevents the installation
of thread-safe grades.
.INSTALL.in:
Mention the new configure options, as well as some previously
undocumented old ones.
scripts/canonical_grade.in:
A new script to be used by configure.in. Its jobs is to print the
canonical version of a grade string.
scripts/canonical_grade.sh-subr:
A new sh subroutine, containing code previously from ml.in that is
now also needed by canonical_grade.in.
scripts/ml.in:
Move code from here to canonical_grade.sh-subr.
Mmakefile:
Include scripts/canonical_grade in tar files, since configure.in
needs it.
bindist/Mmakefile:
Include scripts/canonical_grade in binary distributions, since
configure.in needs it.
