Use $self->db_cmd() in pipeline_create_commands()
Should inherit from EnsemblGeneric_conf
Use the eHive runnable to send HTML emails

This effectively makes the two gene-tree pipelines dependent on eHive v2.2
EGComparaGeneric_conf is redundant with ComparaGeneric_conf
Use $self->db_cmd() instead of $self->dbconn_2_mysql()
Scheme patch for v78
New methods to store the number of *matches