Feature/SystemWildMagic

a few fixes in the build system to be able to use the debian system libraries

adding wildmagic is the last step for a complete build on debian using only system libraries after we already have
- sequan https://packages.debian.org/sid/all/seqan-dev/download
- eigen https://packages.debian.org/sid/all/libeigen3-dev/download

we are in the process of adding wildmagic, currently testing packages can be found here: http://people.debian.org/~lopippo/libwildmagic-packages/

with these fixes and the libraries installed I was able to configure and build OpenMS the way it should be done (TM), namely:

`cmake . && make`

yes, no more crazy cmake flags and contrib dirs and all that stuff...