Various speed-up to purge group/partrepair/blacklist.
Remove sab URL checking #1396.
Speed up purging/reset group more, re-use more class instances, changes to optimise method.
Start classing Tmux, improve Md5 fixReleaseNames threaded work query
Greatly increase monitor loop speed by changing TPG parts count query to use INFORMATION_SCHEMA
Improve monitor loop speed by eliminating per parent category SELECT counts
Chg: Plot to Blob, Compress plot, Fix: Selecting title
Revert category counts for now
Fixing changelog comment.
Second attempt at changing the category counts
Improving efficiency of DB::queryArray().
Merge branch 'dev-db' into dev

Conflicts:
	nzedb/db/DB.php
Updating changelog.
Merge branch 'dev-taskym-xxx' of https://github.com/taskym/nZEDb into taskym-dev-taskym-xxx
Merge branch 'taskym-dev-taskym-xxx' into dev
Chg: Plot to Blob, Compress plot, Fix: Selecting title
Fix: uncompress plot on popup
Merge branch 'taskym-dev-taskym-xxx' into dev
Fix: MySQL memory leaks from cache limit errors in PreDB FT
Fix groups reset issue.