[fix] return error properly when attachment is missing, avoiding a crash (code is still not properly split in this branch)
[evol] removed useless parameter
[evol] improved Order classes a lot (closes #101)
[fix] Order management was broken #2
[fix] don't set command result before every action is done to avoid returning SUCCESS when an exception is raised
[fix] corrected crash due to exceptions returning non-tm
[licence] updated copyright years and added missing headers
[cleanup] moved CommandRunner out of 'bin/postman' and associated L10N strings