Implement new memory check and an invert sort logical
Update the comments and help page
Change instances of invert to reverse
Move reverse variable to just before the scores are ranked
Change memory command to use sed to parse free memory.
Create new test which includes mem argument
metomi/rose#816: add macro option to tutorial
metomi/rose#816: tidy and fix
metomi/rose#816: add macro option reference link
Merge remote branch 'upstream/master' into rose-host-select-add-memory
Update help text to include units
metomi/rose#816: changes following review.
metomi/rose#680: latent page info for rose edit
Changes following review.
Merge pull request #828 from benfitzpatrick/816.macro-option-in-tutorial

#816 - add macro option example to custom macro development tutorial
Update CHANGES.md
Remove None argument from printed threshold output
Merge pull request #829 from jmancell/rose-host-select-add-memory

rose host-select: add method to rank by free memory
Update CHANGES.md
metomi/rose#677: speed up group ignore
metomi/rose#677: rose edit: speed up group remove sections