* src/pp/hbpp.c
+ changed to form the "revision" number from last
ChangeLog.txt entry's date/time.
Revision will now be a 32-bit number, f.e. this
revision: 1303151640 (YYMMDDhhmm). It will be the
value returned by __HARBOUR__.
This can be further formatted for better readability,
as: '130315.1640'
* src/pp/hbpp.c
* fall-back to revision 0 if there is no numeric
revision information in ChangeLog header (for Git)
Revision is useful, so maybe we should go with one
formed from date/time: YYMMDDhhmm -> '130315.1547'
this is quite universal and has some advantages over
sequential nr.