Rewrote gregorian conversion routines, cited use of ICU4J algorithms.  Patch from Hossam Katory
Rewrote gregorian conversion routines, cited use of ICU4J algorithms.  Patch from Hossam Katory

git-svn-id: ee6e786acc44c9cca5ee17c71a5576c45c210361@13761 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful