use path::class::dir variable in error message
override sub for building oligo_target_regions_dir attribute was in wrong action
add note about loading attributes from config files
move oligo target region param attributes into a new seperate role
renamed Chromsome role to something more apt
change to new role name
more logging when doing design create run, also wrap in try block and report if run fails
must have default of empty array for attribute, also more debugging