Update EGSnrc configuration script
Update EGSnrc configuration script

Use 'mkdir -p' to create parent directory on the fly when needed. This
is needed because empty directories "bin/" and "lib" are not stored in
git.

Force the configuration to be the same as the base name of the configuration
file, to reduce confusion.

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