relax SVN archive

Created the empty lib.structure.represent package.

This will be used to hold modules which generate 3D structures as geometric representations of
abstract ideas such as tensors, cones, frames, etc.

Shifted the MolContainer class from pipe_control.structure.internal into lib.structure.internal.molecules.

This is in preparation for shifting the internal structural object to lib.structure.internal and for
the elimination of the unused and no longer useful ScientificPython structural object.

Shifted part of the internal structural object into the lib.structure.internal.molecules module.

This contains the class MolList from the pipe_control.structure.api_base module.

Shifted part of the internal structural object into the lib.structure.internal.models module.

This contains the two classes ModelList and ModelContainer from the pipe_control.structure.api_base
module.

Created the empty lib.structure.internal package for holding the internal structural object.

More decoupling of the internal structural object from the relax data store.

Removed the ability of the internal structural object to determine if two atoms are connected by
consulting the relax data store.

Removed the data pipe checks from the internal structural object.

This decoupling from the relax data store is in preparation for moving into the lib.structure
package.

Package __all__ list updates.

Import fixes for the recent rearrangements.

Split the pipe_control.structure.mass module into two with the CoM code going to lib.structure.mass.