FileRepo: move ZERO_VERSION into Version

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
dist: is not a bnd project

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
dist: fix project setup

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Jar: add some comments

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>