Fix #33875: minimize stretch UV tool incremented in steps of 0.2 instead of 0.1,
and now also shows the shortcut keys for setting the blend value.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53813 954f8c5b-7b00-dc11-b283-0030488c597c