added -X to pecan parameters. Crashes on some sequences for no good reason without -X.
added -X to pecan parameters. Crashes on some sequences for no good reason without -X.

Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara