Issue #847846 by mansspams, marvil07, jaydub, monotaga: Provide 'Reset your...

Issue #847846 by mansspams, marvil07, jaydub, monotaga: Provide 'Reset your vote' link on the widget.

This is a 7.x-1.x port of the original 6.x-3.x patch at #847846-25

Several changes was done in order to have D7 compatibility, but it's also
focused on vud and vud_field, trying to follow #1360572.