New winetricks 20080418: add wmp10, windows codecs, accept new flash version

[Dan Kegel]

Another day, another Winetricks.

Changes since yesterday's annoucement:
 Switch to listing simpler synonyms for changing windows version (long
ones still valid)
 Correct description of volnum verb (it's still needed)
 Fix typo in sha1sum check that caused it to be ignored!
 Update sha1sum for flash player (see comment for URL about the update)
 Much better error reporting for gui users.
 Add wmp10
 Installing wmp9 or wmp10 also gets codecs now

Online as always at
  http://kegel.com/wine/winetricks
or
  http://winezeug.googlecode.com