updated MetFragSlim.jar
Merge branch 'master' of https://github.com/c-ruttkies/MetFragR into database
kept AtomContainer properties
Merge branch 'master' of https://github.com/c-ruttkies/MetFragR into database
add set operations to IAtomContainer
(union, intersect, symmetric difference, asymmetric difference)

Signed-off-by: AK2083 <ankh.egypt.public@googlemail.com>