fix bug 1402, 1413, 1410 for projdesigner: moveTask was lethal, timecalculation wrong 

bug 1410, 1st commit:  in projectdesigner: ..comment out calcduration: 1) allow independent choice of start, end, duration  2) it calculates wrong, anyway
bug 1413, 1402:2. commit:  move Tasks in projectdesigner can loose Tasks. Alternative CTask:moveTasksBetweenProjects is Buggy/ both FIXed
bug id 1410:  
1) on add Task in projectdesigner: when displaying line,  duration is set to -3 hours
2) on changing task end date by 2 days, duration is increased 8 hours (maybe working hours? but then it should be 16 hours).

this pull has commented the js function away. I think it is undesirable to force end=start + duration, and it calculates wrong, anyway.

Now: start, end and duration can be set independently. This probably happens more often than forcing end = start + duration. (like: between today and Friday, I work 3 hours on the Task - cannot currently be set in projectdesigner without this commit

bug id 1402, 1413: replace current  move by changing Task_project which Forgets about children (which then are lost to both Projects) by    CTask::moveTasksBetweenProjects Fix this funczion: it did not remove dependencies, it forgot to set Task_parent = Task_id for top Task, showing it indented in new projects' view

Klaus