[Halld-offline] reconstruction problem in master branch of sim-recon

[Mark Ito]

Folks,

As mentioned at the analysis meeting on Wednesday, there is an issue 
with the master branch of sim-recon that causes reduced efficiency for 
photon reconstruction in the FCAL:

https://halldweb.jlab.org/wiki-private/index.php/December_20,_2017,_Analysis_Working_Group#Minutes

Since then Alex has identified a major set of changes to the matching 
routines as the cause of the problem. These were introduced with pull 
request #1008:

   https://github.com/JeffersonLab/sim-recon/pull/1008

With the holiday break upon us, there is no plan to institute some sort 
of quick fix. The latest tagged release:

   https://github.com/JeffersonLab/sim-recon/releases/tag/2.20.1

pre-dates the change and can be used as a fall-back.

If folks really need a "fixed" version, let me know and we can discuss 
options.

   -- Mark

-- 
Mark Ito, marki at jlab.org, (757)269-5295