Fix HTCondor environment issue, external acces to EOS & more

[IzaakWN]

• Fix lxplus HTCondor environment issue to address Issue HTCondor configuration & singularity for SLC7/CentOS7 compatibility #66.
• Do not pass full environment (with getenv = true), but instead setup CMSSW during job to lighten the load on the HTCondor system.
• Add possibility for CMSSW singularity in HTCondor.
• Add domutau flag in ModuleMuTau to avoid error for non-mutau channels / non-DY samples.
• Move from uberFTP to gFal tools to support EOS outside lxplus (T3 PSI, UCL).

@pmastrap, can you help me validate the changes in EOS.py on your UCL system by running the following unit test with this PR (i.e. the hackathon branch if you have a version), please?

source /cvmfs/cms.cern.ch/cmsset_default.sh
export CMSSW=CMSSW_12_4_8
export SCRAM_ARCH=slc7_amd64_gcc10
cmsrel $CMSSW
cd $CMSSW/src
cmsenv
git clone -b hackathon https://github.com/cms-tau-pog/TauFW TauFW
scram b -j8

# or if you have a TauFW locally:
#git fetch origin hackathon
#git checkout hackathon
#git pull origin hackathon

cd TauFW/PicoProducer
python3 test/testStorage.py /eos/user/${USER::1}/$USER/test -v10

[IzaakWN]

Thank you, @pmastrap for testing! I'm merging this now...