Revert "resolving failing unit test in MDMoleculeTest, the MDMoleculeCustomizer invokes storeAtomData() on it's own which however the core module also invokes this method via (storeData) at the end. This resolution simply cleans up the existing data once the atoms or bonds have been stored. Invoking the method again does not store the atoms twice."

This reverts commit 80cc27babfd8a85da60def975367c251e4093283.

Change-Id: Id5cf60ae15b4ea765588424a6051960f926d9410
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
correctly clearing atom/bond data for MDMoleculeConvention

Change-Id: Ic8de0339ecfa57ca8c2d5ce643ead40b7e232979
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>