Changes for SOFA Issue: 2010-12-01

1. Addition of eighteen new routines to the Time Scales section of the Astronomy Library and three new routines to the Operations on Angles section of the Vector Matrix Library in both the Fortran 77 and ANSI C libraries.
2. A bug has been corrected in jdcalf.c - the result was truncated not rounded.
3. The routine DTDB has been downgraded from a canonical model to a support routine in both the Fortran 77 and ANSI C libraries.
4. WGS72 reference ellipsoid added to note in routines GC2GD and GD2GC in both the Fortran 77 and ANSI C libraries.
5. Commenting error in GC2GDE corrected in both the Fortran 77 and ANSI C libraries.
6. Cosmetic changes to the Fortran routines gmst06.for, gmst82.for, gst06a.for and jdcalf.for.
7. New routines added to the makefiles in both the Fortran 77 and ANSI C libraries.
8. The omission of the copyright statement in nut00b.c has been corrected.
9. The use of mixed-mode in rm2v.c has been eliminated.
10. New routines added to sofa.h and sofam.h.
11. New routines have been added to the test programs t_sofa_f.for and t_sofa_c.c.