0.3.1

New features

• Neighborhood code for cells (eptm.get_neighbors and eptm.get_neighborhood)

• added a ClosedSheetGeometry class

Bug fixes

• fixed bug introducing nan values in cell history

• debugged IH transition and HI transitions decorators

• fixed default list of datasets in io.hdf5.load_datasets

• pass specification as optional in Monolayer

• fix bug in get_outer_sheet

• fixed bugs in lumen volume

• fiexes bug in get_opposite_faces