Changes to get ChemicalAnalyses working
In dehydrate, handle the case where an optional ToOne field is empty
Fixes for the ChemicalAnalyses model and a post_save hook to fix public groups for objects
Basic Create/Read implementation of ChemicalAnalyses; tests need refactoring
Move the valid_post_data variable to a more convenient location
Remove pre-save hook; now using a post-save hook
Rename post-save hook
Objects with public_data=='Y' can be read by any contributor
Restore the auto_verify() method
Preliminary CRUD tests for chemical analyses