Relaod test environment directory structure

The action may be called in order to synchronize file system and database directory structure. The file system has higher priority, i.e. all files and directories that do not exist anymore in the file system are also deleted in the database. Files and directories, that exist in the file system but not in the database will be added to the database.

Updating the complete database may take a while. A progress window shows the number of directory entries already processed. In order to reload part of the file system below a selected directory, the Reload action from test suite tree context menu may be used.