Add gitlog2mewchanges to easily generate 00changes

Please consider updating 00changes.  This script enables you to
easily generate 00changes, as follows:

$ git mv 00changes 00changes.6.5
$ git log --no-merges --decorate v6.5.. | ./gitlog2mewchanges > 00changes
$ editor 00changes # edit by hand to adjust

See also gitlog2changelog to use GNU style ChangeLog:
<http://anonscm.debian.org/gitweb/?p=collab-maint/w3m.git;a=blob_plain;f=debian/gitlog2changelog;hb=f1b0fbdb64380483115ddc13ae36ec03c0800fcf>