list of required tags for the dlcplots

optionally specify alternative dlcs location

refer to python environment on cluster

controler tuning file to tag conversion now part of prepost.hawcstab2

Update dlctemplate.py: removed outdated nn_blr=opt.nn_blr, nn_twt=opt.nn_twt. The template was not working!

prepost.dlctemplate: using all tags uses way too much disk space, only use those necessary to uniquely define each case

set to pbs_in_turb, fix tests