[ADD] Added unit-test for rollbackEntry().
[MODIF] Added compile options.
[ADD] Added set of entry ids, its filling at init and addition of entry.
[MODIF] Entry ids erasing from set of entry ids.
[MODIF] DateTime modified, more constructors, parse method.
[FIX] Fixed undefined reference with
boost::gregorian::greg_month::month_map_XXX some method: added linker
option to link against libboost_date_time.a/so in configure.ac.