2010-05-28 : reverted file name construction to use first/last time. BUT added...

2010-05-28 : reverted file name construction to use first/last time. BUT added precision for daily and higher frequencies
2010-05-28 : fixed a bug in cmor checker when variable entry was "pop" would break
2010-05-28 : fixed default values of noerror in script from True to cmor.CMOR_CRITICAL