* score/include/rtems/score/tod.h: Declare _TOD_Set_with_timestamp()
and _TOD_Get_as_timestamp().
* score/src/coretodset.c: Define _TOD_Set_with_timestamp().
* score/src/coretodget.c: Define _TOD_Get_as_timestamp().
* rtems/src/clockset.c: Use _TOD_Set_with_timestamp().
* score/include/rtems/score/timestamp64.h, score/src/ts64set.c:
Changed parameter types of _Timestamp64_Set().
* rtems/src/clocktodtoseconds.c: Year 2100 is not a leap year.
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