Support method overloading

[PhilLehmann]

While all overloaded methods are being displayed both in the Index and the Methods tab, there are currently two problems:

• not distinguishable on the Index tab
• linking (Index to Methods tab) does not work as it is solely based on the method's name

[Roundaround]

I don't know why this hasn't gotten more attention. This seems like a pretty important feature to me.

[caridy]

@Roundaround, feel free to send a PR with the fix :)

[Roundaround]

@caridy, hehe I just might. Haven't actually had the time to look at the source code for this yet though