Nickel source implementation, including bug fix and example mac file

[pabloferm]

Checked commands working with macros/NiBall.mac.
Checked basic distributions of energy, position and hit PMTs distributions here.
The implementation is based on the SK NiCf source simulation (gamma spectrum, geometry and composition) and the Radon implementation by Guillaume (https://github.com/gpronost/WCSim/tree/Radon_v1.8.0_G4.10.03p03).

[pdeperio]

please also add a description to the PR, including any references to documentation, geometry, tests, and analyses you've done with this branch

[nickwp]

All looks great now. Thanks!

[pdeperio]

can the macros be modularized? i.e. including/calling other mPMT/nuPRISM macros instead of copy/pasting all the parameters? (to minimize the number of macros we need to maintain if some parameter changes.)

[pabloferm]

Sure, I'll do it ASAP

[pdeperio]

Will the spectrum filename eventually be indicated in the macro NiBall.mac? If so, can you automate the process as much as possible for someone obtaining the file?

For example, storing the file on a password protected Apache server, like on atmpd@sukap004:

/home/atmpd/public_html/pdeperio/test_spectrum.txt

which can be accessed with:

wget --user=atmpd --ask-password https://www-sk.icrr.u-tokyo.ac.jp/~atmpd/pdeperio/test_spectrum.txt

So creating a new sourceme script containing this would work.

If you can use your own different server, would be even better so we don't need to share the above credentials with non-SK collaborators.

[pdeperio]

After merging #61, looks like there's some conflicts with radon and injector generators. Please be careful resolving them and consult with @gpronost and @kmtsui if necessary.

[pabloferm]

I am having issues compiling after resolving conflicts due to the following error:
include/GdNeutronHPCaptureFS.hh:52:40: error: cannot allocate an object of abstract type 'GdNeutronHPCaptureFS'

Any idea how to solve this?

[gpronost]

It's probably an issue due to either:

• the Geant4 version you are using
• the compilator you are using

Which Geant4 version are you using? How do you compile? (cmake compilation should be preferred)

[pabloferm]

Ok, solved. Thanks!