fixed off-by-one while reading parameters
Use a hashmap to store received parameters.
Almost ready to request resend of new params
created read parameter by id number method
Request all missing params if final param arrived, but some are missing
Implement watchdog to request missing params when nothing new is sent
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into issue_820
Merge pull request #906 from squilter/issue_820

Issue 820: Parameters download