Changes on store_alternative_tree, for being able to copy with copying trees from previous DBs.
Deal with trees that might have a different number of genes.
It deletes the target tree (if exists) before copying over.
This module loops through all the genes from the current and previous databases.
It idetifies the sequences that have changed and deleted/added
It creates the flag "needs_update" in the gene_tree_root_tag table.
Module used to copy all the trees from a previous database.
It identifies the genes that have been updated, deleted or added
It disavows all the genes that were flagged by FlagUpdateClusters.pm
Removed check if pantherScore did not return any hits.
Merge branch 'feature/update_pipeline' of ebi:~/ENSEMBL/ensembl-compara into feature/update_pipeline