Small clean-up in TSpectrum*

[rvernica]

1. Remove unused SetResolution function and fResolution member from the TSpectrum* classes.
2. Update and add references to external documentation, such as the *.ps.gz papers and the "manual".

[couet]

Hi,

I see you suppressed all the code related to "fResolution". I agree it might be not used but doing that you changed the calling sequence of some constructors. That will trigger some backward incompatibility. Is it really important for you to clean up it that way ? ... Let us know.

Olivier

[rvernica]

I see. I did not realize this might cause issues with backward compatibility.

I did this because of the confusion TSpectrum(Int_t maxpositions, Double_t resolution=1) and SetResolution(Double_t resolution=1) causes. When you read the documentation, you get the impression that you can set the resolution, which is not true. The only way to figure out this is useless it to search for fResolution in the source code.

I can update the patch and leave the function declarations as they are, but make a note in the comments, remove the fResolution member, and empty the body of the SetResolution function. Let me know.

[couet]

One other possibility would be to simply add a comment saying that fResolution is not used right now and could be used/implemented later.

[rvernica]

OK. I will do that and update the patch.

[rvernica]

I updated the pull request per your comments.

[couet]

Thanks. Update done.

[rvernica]

Quick question about the examples in the TSpectrum documentation. Most of them reference the spectra/TSpectrum.root file (example). Is this file available somewhere?

[rvernica]

There is a Jira issue about this file https://sft.its.cern.ch/jira/browse/ROOT-6408