After a CRUD operation, check the redirection doen't trigger an error
Fix incorrect URL, add simple tests for the nutritional plan
Replace JQuery's .post durch .ajax

The short hand function .post doesn't allow to check for error return codes,
while .ajax does. When this happens, the user doesn't get an infitely loading
page, but will at least see the error message.
Fix the templates of the error pages
Remove function hg_version(), was not used
Fix a DeserializationError in python 2.6 when working with decimals