Code documentation, code cleanup and a few minor bug fixes

Remove unused cssmin class
Fix manifest doctype in Blue Eagle and Crypsis
Frontend: Fix a few potential undefined variable bugs
Fix potential undefined variable bugs in plugins
Installer: fix broken error handling
Installer: fix undefined variables, improve code docs
Admin Tools: fix IP cleanup (day limit not working)
Report Configuration: fix a bug in integration settings
Improve library documentation, fix some potential bugs
Improve code documentation, fix some potential bugs
Admin templates: on each file define $this in doc block