TRestAxionSolarFlux upgrades to support additional tables format and original .flux files

[jgalan]

This PR provides a number of updates in TRestAxionSolarFlux to read solar flux data files in different formats and the implementation of new drawing routines.

TRestAxionSolarFlux updates have been documented at: https://sultan.unizar.es/test/classTRestAxionSolarFlux.html

The first relevant change is that the fluxes.rml definitions are now directly placed at rest-for-physics/axionlib-data repository. The file will be naturally found when using the method SearchFile. Few updates were introduced at the framework to achieve this rest-for-physics/framework#184

Other updates in TRestAxionSolarFlux are:

• Now we accept binary format tables, with extension N200f indicating 200 columns float values.

• TRestAxionSolarFlux::ReadFluxFile has been implemented to read directly .flux files and to separate the continuum and monochromatic components.

• • TRestAxionSolarFlux::DrawFluxFile has been implemented to load and draw directly the contents of a .flux file.

• TRestAxionSolarFlux::GetMonochromaticSpectrum/GetContinuumSpectrum/GetTotalSpectrum has been implemented to build an integrated energy spectrum using the full solar disk.

• TRestAxionSolarFlux::DrawSolarFlux will create a plot with the total energy spectrum, and the monochromatic lines spectrum, as it is stored in the data tables data members.

• solarFlux.py has been renamed to solarPlot.py.

In general, we can use solarPlot.py to generate a MonteCarlo test of any flux definition, using the command:

python3 solarFlux.py --fluxname LennertHoofABC_Mono

Which will generate the following plots: