renamed pgplus to pg_plus (bad subdirectries can not be removed) M.Z.
SKIPPED: psi/tecs/pg_plus/grtermio.c psi/tecs/pg_plus/make_gen psi/tecs/pg_plus/makefile psi/tecs/pg_plus/makefile_alpha psi/tecs/pg_plus/makefile_linux psi/tecs/pg_plus/makefile_macosx psi/tecs/pg_plus/pgband.f psi/tecs/pg_plus/pgqinf.f psi/tecs/pg_plus/ttdriv.f psi/tecs/pg_plus/vtdriv.f psi/tecs/pg_plus/xwdriv.c
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