migrate more aspects of OpenMind date objects
We should migrate more parts of OpenMind's Date objects than just the gregorian date.
We need to put the result into the new notes field and the new Time-Span.
Frontend template: https://it-dev.mpiwg-berlin.mpg.de/tracs/ismi/browser/ISMI-OpenMind/src/main/webapp/resources/components/ismi/date.xhtml
Calendar class (older?) https://it-dev.mpiwg-berlin.mpg.de/tracs/ismi/browser/ISMI-OpenMind/src/main/java/de/mpiwg/itgroup/ismi/util/guiComponents/Calendar.java
Edited by Robert Casties