Add "publish" script for PFI geometry

We need a script to handle all parts of publishing a new PFI geometry. Specifically:

Given a human curated XML $file (perhaps in pfs_instdata/data/pfi/modules/ALL/), we want to:

• git add $file
• ln -s $file ALL.xml
• git ci $file ALL.xml -m "meaningful new geometry comment"
• load geometry to cobra_geometry and cobra_geometry_calib_id tables [other ticket]

I propose adding a script to ics_obs_scripts.