[content] added self-destruct
Consequences:
- only one instance of the extension can be running at a given moment
Why?
- the extension is updated in firefox and safari without restarting the browser,
  this could lead to two running instances of the content script.
- once in a while I forget to disable the Webstore version or the release version
  when I load the debug version
Why is having multiple instances running bad?
- because both will listen to DOM changes, which will be triggered by the other
  content script. One mention where the script adds a DOM node is enough to create
  a perpetual loop of modifications (script A then B then A then B then A ...)
[content] about tab on own profile is now also processed
[content] use smallest column in about tab
Adds the info pane to the smallest column instead of the last column.
[content] let's call this a typo, shall we?
[content] added member page support for groups
fixes #33
[project] updated README for new anomalies
[project] added support for Helios anomaly
[options] buttons show more feedback
previously: active = enabled, else = disabled
now: button text shows whether it is enabled, hover will show
     the action your click will perform
[release] prepping v0.6.4
[release] v0.6.4