Merge branch 'gui'
* copy_dir_contents_to_dir has new option preserve_dest_files=True. If explicitly set to False copy_dir_contents_to_dir will try to remove target files that are not in source. Does not work for xcopy tool on Windows.
* Fixed Admin commands create_links and svn2stage to remove target files that are not in source using the new preserve_dest_files flag.
* In gui mode /Admin section, enabled to have more than one limit paths.