Plural categories in one card

[VSHY]

I would like to extend Mnemosine-1 xml format to store a few categories in one card. It will be usefull and convinient, because same word can be learn in different categories.

[helloworld1]

It is a quite challenging to support multiple categories in the current code. I was going to support tag and you can apply multiple tags to a card. However it would be very slow to rename tag for every cards shared with the same tag.