Merge pull request #148 from telefonicaid/hardening/fix-migration-docs

Fix typos and add a section with tips regarding the cygnus configuration
Add a CygnusBadContextData exception class
Catch CygnusBadContextData exceptions in OrionSink
Fix the alarms.md document, describing some missing alarm conditions
Merge pull request #157 from telefonicaid/bug/154

Bug/154 (into develop)