Do not copy threshold_on_ds
Parameters for e77
Fixed the workflow for RAxML EPA
gene counters should not be copied over
Those statistics are generated by the pipeline
species_tree_node_tag does not accept NULL values

This happens when there are no duplication nodes: AVG() returns NULL
Wrap the creation of the MLSS into a transation
Wrap the creation of the GenomeDB into a transation
New script to remove a genome from a collection
Merge remote-tracking branch 'ensembl-github/release/76'

* ensembl-github/release/76:
  species_tree_node_tag does not accept NULL values
Merge branch 'master' of github.com:Ensembl/ensembl-compara

* 'master' of github.com:Ensembl/ensembl-compara:
  changes for rel.77 including automatic gzipping of dumps and stats