Env var UR_DUMP_type_MESSAGES now has precedence over the entity/class/parent setting

Also UR_COMMAND_DUMP_type_MESSAGES for backward compatability.

This means setting UR_COMMAND_DUMP_STATUS_MESSAGES=1 will _always_ print status
messages to the terminal, regardless of what the code does with setting the
$obj->dump_status_messages() mutator
Merge branch 'master' of github.com:genome/UR