altered formula parsing logic:
entities called molecules before may now be nested.
groups can be grouped by [] and () now
added handling for trailing dot (like H2O.)
improved loadDetails methods
added some exception handling
added Formula to substanceNode
added spontan field to reactions
removed cloneNotSupported throw from ReactionSet.clone
reactin nodes now show stoichiometry of substances
reimplemented getCode and reactionList using XmlToken class
rewritten getCode methods to avoid massive creation of stringbuffers
added new Exception
Merge branch 'master' into devel