Auto fix for tags with ","

[wellemut]

Problem

Tags with Komma are somehow allowed. Thats stupid and not useful.
It happens when I copy a comma seperated list of tags into the tagfield.
And in the end, I have such stranges tags:

Solution

The Backend should

• Strip all #, comma and spaces and - from the front and the back of every tag before saveing
  - #tag -> tag
  - ,tag -> tag
  - tag, -> tag

• seperate all tags which contain space, comma or # sign
  - tag1,tag2 -> tag1 and tag2
  - #tag1,#tag2 -> tag1 and tag2
  - #tag1, tag2 -> tag1 and tag2

That would be great
(The frontend should not receive an error message. It should be a silet auto-fix in the backend)
The Frontend seperates allready words with space in between "tag1 tag2" becomes "tag1" and "tag2"