Update rcsparse from upstream, and improve the mechanism for doing so.
tree93894cb9d0809500ecc9fc7054dec61d2a15e57a
-rw-r--r-- 1728 BUGS
-rw-r--r-- 861 COMMITTERS
-rw-r--r-- 2725 COPYING
-rw-r--r-- 587 HACKING
-rw-r--r-- 3504 README
-rwxr-xr-x 164106 cvs2svn.py
-rwxr-xr-x 2521 datecheck.py
-rw-r--r-- 20637 design-notes.txt
-rwxr-xr-x 677 dist.sh
-rwxr-xr-x 993 dump-db.py
drwxr-xr-x - packages
-rwxr-xr-x 1068 profile-cvs2svn.py
-rwxr-xr-x 2965 profile-repos.py
drwxr-xr-x - rcsparse
-rw-r--r-- 14126 redesign.txt
-rwxr-xr-x 49188 run-tests.py
-rwxr-xr-x 2663 show-db.py
drwxr-xr-x - test-data
-rwxr-xr-x 12799 verify-cvs2svn.py
drwxr-xr-x - www