Revision 93

Moved variable calendar_used, un_an and mon_len from module calendar
to module ioconf_calendar_m. Removed unused variables cal, start_day,
start_sec of module calendar.

Inlined procedure ju2ymds_internal into procedure ju2ymds. Inlined
procedure ymds2ju_internal into procedure ymds2ju.

Removed generic interface ioget_calendar. Merged ioget_calendar_real1
and ioget_calendar_real2 into ioget_calendar_real.