Fixed version numbers which were treated as floating point numbers,
not as v-string. [rt #27350 - Andres J. Knig andreas.koenig@anima.de]Fixed _set_datetime() which failed whenever a 31st day didn't exist
in the current month. [rt #27360 - Chia-liang Kao clkao@clkao.org]Reversed the order of the day/month/year setter calls within
parse_datetime(). [mike pulsation@gmail.com]Added a 'prefer_future' option to turn ambigious weekdays/months
to their futuristic equivalents - implemented by counting how often
an unit was being modified by the appropriate setter call within the
Base class. [Shawn M. Moore sartak@gmail.com]Extended the test-suite to include more exhaustive tests and accordingly
updated the EXAMPLES in the language metadata classes.Introduced the public method trace() which will show which methods were
called within the Base class and how often certain units were modified
by according Datetime setter calls.