* Add flag to API which allows using pack size when adding stock items manually
* Check for use_pack_size before pop
* Add test data and tests
* Improve data handling
* Add form field for use_pack_size when adding stock
* Add description of pack size to docs
* Don't check for supplier part if it is None
* Move form field to after supplier part, for better logic
* Fix wrong function
* Fix tests
* Adjust purchase price when using pack size
* Adjust help text for purchase price
* Adjust help text for purchase price some more
* Fix tests for purchase price of added stock
* Update api_version.py
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