The clocktable can now more easily select the correct time range
that should be considered when summing times. S-right and S-left
in the "#+BEGIN: clocktable" line allow to shift the time block around.
Also some code-cleanup.
This required changing the Makefile.
I also added a new program set-version.pl that can be used
to synchronize the version number in all core files of the
distribution, along with the web files.
Carsten Dominik