Made changes to psims2[WTH/met].py to better handle units and to OUT2psims.py to handle missing data
Added append.single.sh to bin to perform append for single latitude band and variable and made small modification to merge_ascii.sh
Modified ggcmi make scripts and made trivial change to append.single.sh
Use new append.single and optimize where possible
Merge branch 'master' of https://github.com/RDCEP/psims

Conflicts:
	bin/append.single.sh
Fix input dir in merge step
Send full path name to params.psims
Have merge mkdir if needed
Fix for finding lons of part outputs based on filename