changes for rel.77 including automatic gzipping of dumps and stats
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
New API method to set a GenomeDB as non-default
New API methods to manipulate collection species sets
More GenomeDB-manipulation options in update_genome

As more API methods have been introduced into SpeciesSet and GenomeDB
adpators, we can have simple options in update_genome.pl to add or remove a
species in a collection, and to set a species as non-default.
This leads to the removal of the short-lived undefault_genome.pl
Update the documentation for the new options
Use Pod::Usage for the doc
Parameters for e77
work_dir is not needed
The "1Gb_job" resource class is already defined and means the same