replace calendar module by a new one

ChangeLog

app/cdi.c

src/Makefile.am

src/Makefile.in

src/basetime.h

src/calendar.c

src/calendar.h

src/griblib.c

src/make_cdilib

src/stream_grb.c

src/stream_int.h

src/taxis.c

src/timebase.c