Revert "added back deprecated methods start() and end()"
Revert "added back deprecated methods start() and end()"

This reverts commit f83e813e3d5ad881b8de103d87724346595c2bbb.

kumarsaurabh20/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara,ckongEbi/ensembl-compara,Ensembl/ensembl-compara,kumarsaurabh20/ensembl-compara,etapanari/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,kumarsaurabh20/ensembl-compara,Ensembl/ensembl-compara,ckongEbi/ensembl-compara,ckongEbi/ensembl-compara,Ensembl/ensembl-compara,etapanari/ensembl-compara,kumarsaurabh20/ensembl-compara,etapanari/ensembl-compara,Ensembl/ensembl-compara,etapanari/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara