Better support of mzML files

[AlexandreBurel]

In the peak_finder_proxy file, an mzML file should use the correct peak finder regarding its original format, instead of a default algorithm. Doing this, a Thermo raw file and its mzML conversion should produce the same mzDB file.
It goes the same way for centroiding algorithms, within ProteoWizard. We should check whether ProteoWizard uses the vendor's algorithm or not, and if not how to force its use.

In case the mzML file comes from an unsupported file format, we should keep the original spectra as they are instead of using algorithms that will most likely not be adapted.