Fix stock status result

Was previously using hard coded min/max values for months of stock so
the reports were broken.
Update casexml
Merge branch 'master' into stock-status-fix-again

Conflicts:
	submodules/casexml-src
Move StockState from casexml / add data migration
Merge branch 'master' into stock-status-fix-again

Conflicts:
	submodules/casexml-src
Merge branch 'stock-status-fix-again' into autostaging