Changes the UserMembershipProvider to validate an already hashed/encrypted password and then validate a non hashed/encrypted attempt, this is to maintain compatibility with how v6 works, it's not ideal but needs to be there. Creates a settable property on the password changer to be able to dynamically hide the old password field if you are going to manually set the old password. Updates the EditUser to hide the old password field and pass in the alraedy encrypted pword to validate against like it used to be.
Merge branch '6.2.0' into 6.2.0-membershipprovider

Conflicts:
	src/Umbraco.Web/Umbraco.Web.csproj
Merge remote-tracking branch 'origin/6.2.0-membershipprovider' into 7.0.0

Conflicts:
	src/Umbraco.Web/Umbraco.Web.csproj
Fixed the horrible mess that was the permissions editor dialog.