pzs-ng force nfo first and bot pretime mysql fix

- Added an option to tell pzs-ng to force the upload of a nfo file first (sfv dirs only). No nfo, no race! Default: option is disabled.
  New related configuration options are: force_nfo_first, noforce_nfo_first_dirs
- Modified the ngBot and themes to support the announce of BAD_FILE_NFOFIRST
- Fixed PreTime bot plugin to avoid bot freeze/crashes if mysql server goes away if idling too much time.
- Added a configurable public chan trigger to Pretime bot plugin, so the users can check the pretime of a release.
Merge branch 'forcenfo' of https://github.com/madjik/pzs-ng into forcenfo
Support for group names in Top.tcl - new GrpTop.tcl plugin

- Modified Top.tcl to display users group name
- Added GrpTop.tcl inspired from Top.tcl to generate a top groups report