getrun update

[nthallen]

getrun has been a kluge forever. I now have locate_rundir as a core utility. It's time to make this easier to use.

Priorities:

• For backwards compatibility, allow individual users to determine where extracted data should be stored
  • This is both implicit and explicit in the current implementation
• Run out of $HomeDir for consistency with all the other instrument scripts and direct access to Experiment.config
• Read from getrun.cfg and/or .getrun.cfg, which should define:
  • GSEs: colon-separated list of GSE machines to search
  • DataDir: directory where extracted data runs are stored
  • Options to specify extra data directory retrieval
• runs.dat or a hidden version could go in $HomeDir
• Will we still need the Exp_Data_Dir script in eng?
  • It is referenced by ui_Exp, but maybe that could be finessed somehow?