Updated list of foreign-key checks
New test for foreign keys of the CAFE data
New abstract runnable to test self-foreign keys
New test for foreign keys of the GeneTree data
New test for foreign keys of the SpeciesTree data
Flat trees are completely forbidden
Only the Ensembl members are linked to a DnaFrag
New Compara HC to check the size of all the tables

It compares the current database to the previous one and reports all the
tables with a significantly-different size (<95% or >110%)
This one now applies to members
Split the HC into genomic / homology / shared parts
Named species sets are only used in the genomic part
Cosmetic changes
New HC for the "threshold_on_ds" tags
New HC to check for the presence of stats in the species_tree_node_tag table
method_link_id 11 is not for alignments (constrained elts)
Up-to-date list of HCs for the Compara groups
Added some EG HCs
Use the correct mlss tag
cosmetic
We do have LRG dnafrags in our final database, now