Add Calculator.java
Merge branch 'master' of https://github.com/juppe69/InPUT
Merge branch 'master' of https://github.com/juppe69/InPUT into juppe69-master
finalize the merge 16, remove irrelevant files.
simplified the offline use description.
added updated license to all source files.
Merge branch 'master' of https://github.com/feldob/InPUT