fix for COGE-393 and COGE-45

The child process inherits the parent environment which includes apache
and its modules. In mod_perl it is require that child call CORE::exit
otherwise the child process will be kept alive.

	modified:   web/LoadAnnotation.pl
	modified:   web/LoadBatch.pl
	modified:   web/LoadExperiment.pl
	modified:   web/LoadGenome.pl