RecipeManager.parse_ingredient does not handle decimal values correctly

[cydanil]

In the record card, it's possible to write a line for an ingredient, in a semi free format:

1.5 cup oil
1 c. oil
1.5 c. oil
4/5 tsb. oil

However, the parser for this content is broken, due to an incorrect regex, and returns something along the lines of: {'amount': '1', 'unit': '.5', 'ingredient': '.c oil'}

This is an old issue that has already been present in previous releases of Gourmet.

The regex is defined here, of which the faulty sub-regex is defined here.

Moreover, commas in decimal values (eg. 1,5) are not supported.