[Halld-offline] Conversion to Git, Wed., July 15, 5 pm, and new information wiki page

[Mark Ito]

Folks,

A reminder that the deadline for checking in changes to hdds and 
sim-recon under Subversion is 5 pm EDT, tomorrow, Wednesday, July15. 
After that changes should go to our repositories on GitHub.

I've put together a wiki page collecting materials related to the switch:

https://halldweb.jlab.org/wiki/index.php/Conversion_from_Subversion_to_Git

There are two new pages linked from there:

   * Instructions for Working with GlueX Git Repositories
   * Git Help Resources

   -- Mark