Fixed various issues reported by resharper. Added move constructors/move assignment operators to various classes. Exceptions cleanups. Removed unused code. Removed copy constructors/copy assignments from various noncopyable classes. (CH-318).
Completely disabled sending http headers as they are causing trouble not only in WinXP but also Vista. Improved the user agent string. Additional cleanups in update checker. (CH-241).
Modified updates checking: - added new option to let user decide if he wants secure connection or not (with autodetection), - fixed error messages being displayed incorrectly or empty, - fixed ability to re-check for updates after failure. (CH-241).