Removed natoms_ from Molecule, atoms_.size() is enough
Minor build improvement for lcao/dftest
Minor documentation update for StateIn.
DescribedClass is derived from RefCount virtually to support multiple
inheritance of DescribedClass children.
Significant redesign of internals of GaussianShell and GaussianBasisSet.
GaussianBasisSet is implemented as a vector of GaussianBasisSet::Shell
objects. Shells do not need to appear in the same order as centers.

See Jira issue MPQC-70 (http://valeev.chem.vt.edu:8080/browse/MPQC-70)