Update egsnrc.macros for uniform run control
Update egsnrc.macros for uniform run control

- Add macro $URC-DEFAULT for initialization; defaults to .false.
- Add variable is_uniform_run to exit egs_pjob_* routines.
- Add macros $egs_track* to debug Mortran apps after units are closed.

crcrewso/EGSnrc,nrc-cnrc/EGSnrc,MartinMartinov/EGSnrc,crcrewso/EGSnrc,MartinMartinov/EGSnrc,nrc-cnrc/EGSnrc,MartinMartinov/EGSnrc,MartinMartinov/EGSnrc,crcrewso/EGSnrc,MartinMartinov/EGSnrc,crcrewso/EGSnrc,mchamberland/EGSnrc,crcrewso/EGSnrc,mchamberland/EGSnrc,nrc-cnrc/EGSnrc,mchamberland/EGSnrc,mchamberland/EGSnrc,mchamberland/EGSnrc,mchamberland/EGSnrc,nrc-cnrc/EGSnrc,nrc-cnrc/EGSnrc