Fix warning message for IAEA phsp source with particle Z-positions scored.
Fix warning message for IAEA phsp source with particle Z-positions scored.

Previously, SUBROUTINE ISOURCE attempted to access ICM_TYPE before it
was defined, leading to an erroneous warning message that INIT_CM was
not of the correct type when reading incident Z-position for each
particle.  This check has been moved to SUBROUTINE SRCOTO.  Bug found
by Jarkko Ojala.

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