Now can add hyperlinks to comments, and clicking on a hyperlink opens it in an external web browser

* Issue 701/3c4 (Shouldn't be possible to add an issue with no summary) fixed.
* Issue 701/d44 (Copy and paste is broken and doesn't work. This is very urgent to fix, as it makes BEurtle practically unusable.) fixed.

Signed-off-by: Niall Douglas (s [underscore] sourceforge {at} nedprod [dot] com) <spamtrap@nowhere.com>