Implemented channel dependent multi_channel setting in NNLOJET runcard; implemented channel dependent setting of OMP threads for NNLOJET(use_cpus); missing: channel dependent no. of CPUs to request in htcondor config (request_cpus)

Numerous changes to fix issues from transition to NNLOJET modules2; added actual luigi/law configs as templates; added CMS7TeV dijet setup as example runcard and steering

Update law to `v0.1.12`, reduction of code duplication, and various small fixes.

See merge request !6

Make law setup work on bms1 and probably bms3, too, with new local sw setup using LCG software stack

Numerous fixes, but successfully re-run test sceanrio from lxplus setup at ETP; everything runnable from C7 portal machines now including all plotting thanks to new fastNLO install using lcg101 software stack