Merge pull request #661 from nZEDb/dev

Dev
Merge pull request #662 from nZEDb/dev

Dev
Merge pull request #663 from nZEDb/dev

reverted to previous method for threads of incomple pp cats
upgrading to python 3
merging
Merge branch 'dev' of github.com:nZEDb/nZEDb into dev

Conflicts:
	misc/update_scripts/nix_scripts/tmux/monitor.php
	misc/update_scripts/threaded_scripts/backfill_safe_threaded.py
	misc/update_scripts/threaded_scripts/postprocess_threaded.py
update pymysql to work both python 2 and 3
oops
missed some changes
updated all python scripts to use 2 or 3
updated scripts to check for and use python3 if installed
added 5 min max runtime in bin/backfill
Merge pull request #666 from ugokanain/dev

Dev
removed hard-coded db name
updated start.php to sqlpatch 80
Merge pull request #669 from nZEDb/dev

Dev
Merge pull request #670 from nZEDb/master

Master to dev
rmoved queue limits where not needed
changed from python-pymysql to python-cymysql
updated docs for cymysql