ADD accumulator writes PID into a file
Simplified accumulatorStop. accumulator-server kills older accumulator-server on startup
fixed two problems with output to stderr
fixed ONE MORE problem with output to stderr
FIX issues raised on code review
Merge pull request #623 from telefonicaid/hardening/accumulator_pid_in_file

Hardening/accumulator pid in file
fixes for PR review
64->50 en CHANGES_NEXT_RELEASE
Avoided a few possible crashes
Merge pull request #625 from telefonicaid/feature/616_len_of_FiwareService_string

Feature/616 len of fiware service string
Merge branch 'develop' into hardening/619_forbidden_characters
func test change as response for 'service not found' has changed