Make MAX_PROCESS_SIZE configurable
Make MAX_PROCESS_SIZE configurable

This change allows us to set different value for the MAX_PROCESS_SIZE for each division
and make it under source control.

Related to ENSEMBL-4763.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode