Log Message:
Avoid deprecation warnings under Python:
1.) Use "hashlib" instead of "sha" module if possible.
2.) Use "subprocess" module instead of os.popen3().
Both changes tested with Python 2.4 and 2.6.

Pkgsrc-related improvements:
1.) Support "user-destdir" installation (no changes required).
2.) Set license to "gnu-gpl-v2".
3.) Reduce patches by recording the fact that the manual page gets
    compressed automatically (which "pkgsrc" handles fine) instead
    of trying to prevent that.