Includes fixes for two security bugs, issues with several Thingy form control types, and anonymous registration.

Changelog:

 - fixed: International characters in password prevents login
 - fixed: SelectSlider form control is broken
 - fixed: testEnvironment.pl can't find WebGUI modules after installing a prerequisite
 - fixed: Thingy list type form elements do not support key/value pairs (SDH
   Consulting Group)
 - fixed: Select Slider borked in Thingy (SDH Consulting Group)
 - fixed: Combo box does not show possible values in Thingy (SDH Consulting
   Group)
 - fixed: Cross site scripting issue on operation pages
 - fixed: Shop: Percentage of Weight Shipping Method doesn't work
 - fixed #8776: duplicate does not duplicate keywords
 - fixed: anonymous registration with email confirmation is broken
 - fixed #8790: email password recovery allows sending recovery mail to arbitrary address
 - fixed: Submitting recurring events generates multiple version tags