moved PMA_array_* functions to core.lib.php
moved PMA_read_userprefs_fieldnames() to user_preferences.lib.php
server/database/table filename templates are saved to pmadb when "remember template" is checked
- add icons to category tabs
- user overrides were unavailable in CSS files
- apply saved configuration immediately after save, reload navigation frame if it's affected
- disabled overrides marked in user preferences forms
