[mEIC_det_software] gemc and banks devel updated

[Zhiwen Zhao]

hi, All

We have fixed a major bug causing large file size in gemc devel version.

To update, you should source your set_solid and then do go_gemc, then
go_banks, then recompile "eic_gemc"
refer to
https://eic.jlab.org/wiki/index.php/Installation_of_framework#keep_it_up2date

see the change log here
http://www.jlab.org/12gev_phys/packages/sources/gemc/changelog

Zhiwen