Solve 'year 0' problem in breakDownMJD as revealed by test02 of qsastime_testlib.  Subsequently I strengthed the test suite and found a "December 31st" problem, so there is more work to do.
Solve 'year 0' problem in breakDownMJD as revealed by test02 of
qsastime_testlib.  Subsequently I strengthed the test suite and found a
"December 31st" problem, so there is more work to do.

svn path=/trunk/; revision=9513

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot