clo: Long option, java style.

* src/dctc/java/com/dataiku/dctc/clo/FJavaLongOption.java: Here.
find: Use java long option style.

* src/dctc/java/com/dataiku/dctc/command/Find.java: Here.
find: Test

* tests/find.test: Here. Fail due to `follow link' policy.