Add missing header
Fix wrong chain mode iterator result for singular dimensions in hypercubic basis shapes

Note: This bug did not cause any harm because we filtered out
      the elements that are too much later when writing the results
      of a stencil application back to M[mu(k)].
Fix issue with gradient computation.

We missed parts of the gradient coefficients c'_k for
all phi_k with k at the upper boundary of the basis
shape K. These are high-k contributions which often
have negligible coefficients. But in the example of a
Gaussian phi_0 and |K| = 1 we get zero gradient and
zero kinetic energy in case p = 0.

Note: Algorithm 9 on p. 64 of MT *is correct* only the
implementation was wrong.
Eigenstate computation
Fix plot of wavefunctions when no "dt" parameter is available
Merge pull request #38 from raoulbq/fix_ekin

Fix issue with gradient computation.
A threefold morse potential

The potential was taken from the following paper:

@article{ST,
  title = {Phase-Space Approach to Solving the Time-Independent Schr\"odinger Equation},
  author = {Shimshovitz, Asaf and Tannor, David J.},
  journal = {Phys. Rev. Lett.},
  volume = {109},
  issue = {7},
  pages = {070402},
  numpages = {5},
  year = {2012},
  month = {Aug},
  doi = {10.1103/PhysRevLett.109.070402},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.109.070402},
  publisher = {American Physical Society}
}
Fix 2D potential plotter script
Merge pull request #40 from raoulbq/chain_iterator_fix

Fix wrong chain mode iterator result for singular dimensions in hypercub...
Implementation of linear combinations
First version of LC inner products
Remove overlap matrix in LCWP

We can now compute this matrix easily with new inner products.
Implement clone
Wavepackets know how to compute their gradient
Improve linear combinations
Review and document inner products of linear combinations
Review and document observables of linear combinations
Fix missing block selection in evaluation scripts
Helper functions for loading and saving whole wavepackets at once.
Simplify file creation with IOM, drop parameters input.