Simplifying opening of TRestRun and TRestDataSet files

[juanangp]

Simplifiying restRoot behaviour for opening TRestRun and TRestDataSet

• Reimplementing TRestAnalysisTree, TRestEvent and metadata objects in a dedicated macro REST_LoadInputFiles.C
• Droping support for multiple files, now only one TRestRun and/or TRestDataSet can be opened (the first one)
• If the file is not a TRestRun or a TRestDataSet it just use default root behaviour using TRint
• Now the flag to load macros is just --m instead of --m 1 since the latest is misleading and error prone.

[jgalan]

But analysisTree, eventTree and metadata objects have been removed from the automatic instances ... I find them handy.

I agree you simplify things, but without removing functionalities.

It is not better to simplify it in #441?

[juanangp]

But analysisTree, eventTree and metadata objects have been removed from the automatic instances ... I find them handy.

I agree you simplify things, but without removing functionalities.

It is not better to simplify it in #441?

Ok, now the opening of input files is done using a macro, I didn't implement metadata yet

[juanangp]

But analysisTree, eventTree and metadata objects have been removed from the automatic instances ... I find them handy.
I agree you simplify things, but without removing functionalities.
It is not better to simplify it in #441?

Ok, now the opening of input files is done using a macro, I didn't implement metadata yet

Now metadata objects are also implemented, note that this PR is pointing to #441 instead of master. Please, do this merge before merging #441 in master.