esys.lsm.geometry: Defines modules and classes which can be used to generate various
packings of particles and creating bonds/connections to be used in
conjunction with the LSM.
esys.lsm.geometry.SphericalGrainGen: Defines classes, instances of which, can be used to generate
spherical grains packed with randomly sized circular particles.
esys.lsm.util.OptParse: Defines OptionParser class which extends
optparse.OptionParser class by adding 'string_list',
'int_list' and 'float_list' option types.