[FIX,TEST,PYOPENMS] fix after pull request #988

- testfix after f9cfd1269c268a72c835c2d0da3f0094cd78adae (see pull request #988)
- hasElement was removed, remove corresponding test
- add test for hasElement(Element *)
[FIX,TEST,PYOPENMS] fix after pull request #959

- fix errors in 4308f5f7d60982ef9f73931b7d0fa914088253b7 (see #959)
- typos
[FIX,TEST,PYOPENMS] fixes last tests in FeatureMap
Merge pull request #1001 from hroest/fix/pyOpenMS_test

[FIX] fixes for failing pyOpenMS tests