changed tmux backfill query to ignore skipped groups
fixed typo in schema, added missing index from schema, fixed several bugs in tmux scripts, added option to reet only releases without covers or previews
added $processSample check for 2 postprocess additional functions
added backfill days to other backfill in tmux
Merge pull request #316 from nZEDb/dev

Dev
Merge remote-tracking branch 'upstream/master'

Conflicts:
	misc/update_scripts/nix_scripts/tmux/optimise.php