Common/shared regex filters/xfst files
- where to store them?
- how to include them?

=> use $GTCORE in *.am files

AC_ARG_VAR([GTCORE], [use gtsetup.sh to declare])

in subfilter.am e.g.:

sub-filter.hfst: $(GTCORE)/gtshared/.../sub-filter.regex
    $(HFSTREGEX2FST) $(HFSTFLAGS) -i $< -o $@

morphology.nosubs.hfst: morphology.default.hfst sub-filter.hfst
    $(HFSTCOMPOSE) $(HFSTFLAGS) -1 sub-filter.hfst -2 morphology.default.hfst

?