fixes #96
Command.js:
- moved "subcontents" up 1 level, now son of result instead than result.content
- in case of single record, result.content is an array of one element
db.js:
- unified result.content management, now three cases can be handled with the same for loop
- processResult now requires 2 args, content and subcontents
fetch_plan.js:
- wrapped the test around another call to prepareDatabase so to have a richer database to query and to test what happens when mupliple records are returned