Implemented FWHM estimator. Works.

The fwhm estimator works, and triggers warnings. For now it doesn't
react properly, as it is the non-smoothed signal it works on.
Added the goodies as well.. I'm a sporadic idiot.

The data_manipulation needed commit... Cleverly!
merge Olis_branch and Adding_FWHM_estimator to master branch, files working, FWHM module running, further comments needed