remove parasite prints.
correct service type terms loading code

handle "list" data terms in type, by using only first item.
FIXME: settle for a way to handle this elegantly.
modify mobyle errors and job to save job errors.

* MobyleError properties are saved in a dictionary
* Job.set_error() saves an error and sets the job status to ERROR.
Merge branch 'develop' of https://github.com/mobyle2/mobyle2.lib into develop
add forgotten "from_json()" methods from type.py