Feature wxmaxima

Backported wxmaxima from ubuntu 14.10

Fixes #12785

See merge request !8

1 v4 allow ckermit into belenos

A rework of !3 to ensure the old commits are dropped.  That was simply me starting the weekend without either getting an update from @aklis or doing a long paperchase through the repos.

As per !3 i.e.

As per leny2010/package-helpers#1 ckermit has been free for some time. It has now percolated down to Multiverse in Trusty. Here is the package helper to bring it in.

I suggest you close !3 rejected

See merge request !4

Fixes #12785

Fix helper for firefox 34

See merge request !2