BUG/CLN: Exception in HDFStore are now ValueError or TypeError
A table will now raise if min_itemsize contains fields which are not queryables

this solves the bug (update 4): http://stackoverflow.com/questions/15488809/how-to-trouble-shoot-hdfstore-exception-cannot-find-the-correct-atom-type?noredirect=1#comment22113979_15488809
