Added ability to remove subsets of data from DataFile table.
Added ability to remove subsets of data from DataFile table.

Simply included keywords to pandas.HDFStore.remove(). Will make
available to Aggregator Data.remove().

Also, added an exception to DataFile.add_data so that pandas objects
created from numpy arrays without column names can be added without
problems caused by indexing of columns by pytables. Of course, this
means that columns can't be indexed using where, but it does mean that a
numpy array can be stored with minimal effort.

datreant/datreant.core,andreabedini/datreant,datreant/datreant,dotsdl/datreant,datreant/datreant.data,datreant/datreant.core,datreant/datreant