Include full name of orgdb annotation package in the error message
if missing; delay stop() until both txdb and orgdb packages are
checked and include both in error message if they are missing.
Coverage decreased (-1.7%) to 58.883% when pulling d2fafe959a9c10a525f957b755d0203d89bd2216 on kdkorthauer:master into a5ee3cba9c3bd0b4e933eb1058d57665e8eb5c2d on rcavalcante:master.
Include full name of orgdb annotation package in the error message if missing; delay stop() until both txdb and orgdb packages are checked and include both in error message if they are missing.