Addition of an "Upload File" utility: upload_wrkfile.php. Features:
- Selection of single or multiple files.
- Upload fixed to .../wrk to avoid files loaded anywhere in the databases folder
- Filename sanitation: lowercase, no spaces, %, ', ", &
- Explicit indicator to allow overwriting existing files.
- Extensive error checks
This function is available in Utilities->Export/Import menu (menu_bar.php).
This function is available in "Import ISO file" (vmx_import_iso,php).
The deleted files are unused ghost files