Cvsplot 1.7.1 released

Fixed minor bug in 1.7.0, which contains the following new features:

* Added per-user CVS statistics, with initial work provided by Jacob
Schroeder <skrotonomous@users.sourceforge.net> and Tim Wood
<tim@advancedprediction.com>, but extended so that it properly
handles files that are removed, then re-added, and so that it is
possible to see the CVS contributions performed by individual users
plotted using gnuplot. The -userdata option will output per-user
information into the specified file. By default, this will record
data for all CVS users found, however this can be limited by using
the -userlist option, if there are only a limited number of users of
interest.

The -gnuplotuserdata, like the other gnuplot options will produce a
graph, which provides an interesting view of how the total line
count is broken up amongst individual users.

The -countchangedlines option affects the way the linecounts are
calculated. If the -countchangedlines option is set, then the line
counts indicates lines _changed_, not _added_. So if a commit added
5 lines, and removed 3, the count would be 8, not 2. This was
requested by some users who want to use this option as a rough
measure of productivity.