Windows GUI: Usability - the 'create xlink' dialog has been improved:
* The 'xlink name' text input field will be autocompleted when the target repository is selected if the user doesn't manually alter it.
* The 'use relative server' checkbox is enabled by default.
* Added a tip to remember that the content of the xlink is not loaded until the user performs an 'update' operation.
Windows GUI: The embedded diff on the pending changes view was throwing an error if the 'previous' button was clicked when the current selected difference was the number 0 (this could happen right after modifying an unchanged file). Fixed.