Remove all pops with abundance < 0

Thought these were logged, all at the end are actually
standardized
Remove datasets I discovered are GPDD entry errors
Cull out main_ids that we're no longer using
Cache some modelling
Comment out old code
Tweak the colour scale on subpanels in fig2
Important: set xlim on fig 2 subpanels
Fix values-for-paper tex file
Ignore a XLS file
Add an in-progress data check .xls file

Will change to .csv when finished but Excel drives me nuts
warning me about saving each time
Add a .csv with all data errors I discovered

From the heavy pops
Update a data filtering rule in the supp.
Add a quick R make file