Add a few patches from Debian package:
    
      0003-Setup-the-correct-version-number-in-rss2email.py.patch
      0006-Prefer-utf8-in-CHARSET_LIST.patch
      0008-Fix-encoding-of-From-and-To-headers.patch.diff
    - Merge a few update for the manual page.
    - Minor spec clean-up to remove superfluous items.