Replace Bioperl 1.2.3 with 1.6.924 in test environment
Replace Bioperl 1.2.3 with 1.6.924 in test environment

In anticipation of standardising on 1.6.924, production can now test on the newest safe version of BioPerl. 1.7.2 currently blocked by this issue: https://github.com/bioperl/bioperl-live/issues/266
Ensembl/ensembl-production,Ensembl/ensembl-production,Ensembl/ensembl-production