comment calcduration: 1) allow independent choice of start, end, duration  2) it calculates wrong, anyway
fix movetasks in projectdesigner, fix method Ctask::moveTaskBetweenProjects, which does not remove dependencies and does not set task_parent
Merge pull request #239 from opto/projdes

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