chg: activate ehv.lib
chg: disable omInitGetBackTrace/omGetBackTrace if __OPTIMIZE__ is defined
chg: better error message for export
doc: killattrib with one argument
removed unused killlocals_list
fix: removed unused atGet variants
fix: removed feGetOptValue (->feOptValue)
chg: removed some unused funktions from Minor.*
chg: cleanup janet.*
removed LHdl
simplifyed rindep. tests
fix: ring dep. for multiple return results
add: ncpreim.lib

Conflicts:
	Singular/singular-libs
compare singular-libs (PLIBS) with spielwiese
update all.lib: ehv.lib, ncpreim.lib
fix: quote(not something)

Conflicts:
	Singular/grammar.cc
fix: crossref. for texinfo
fix: HAVE_TAIL_RING is set in kutil.h for all k*.cc
fix: disable interred for ring-cf
Added test for reesclos