Log Message:
Update from version 0.61nb1 to 0.63.

Pkgsrc changes:
 o Changed MAINTAINER to pkgsrc-users@ as per communication with maintainer

Upstream changes:
0.63   2008-07-21
- minor tweak in union(); added tests

0.62   2008-07-20
- fixed a problem in union() that caused first() to return a wrong result.
  reported by David Gang