Cif2cell

* The package now bundles the prerequisite PyCifRW package and will
install it automatically in case it is missing.
* The standard docstring now comes with a citation of the CIF2Cell
publication and a request to cite. Why do I bother you with this?
Well, mainly because CIF2Cell now becomes bundled in other
software packages and users may lose track of the source of the
tools they are using.

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* Tweaks and bugfixes in the ABINIT interface (with thanks to Kevin
Jorissen).
* The --supercell-translation-vector option is now also known under
the more informative name --supercell-prevacuum-translation and
supplemented by a --supercell-postvacuum-translation option. This
fixes the lack of functionality for deciding where in the unit cell
the vacuum should be in slab calculations etc.

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* Minor tweaks of the RSPt interface

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* New interface: Hutsepot

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* Fixed bug in supercell generation when using python 2.7.
* Improvement in installation script (checks for PyCIFRW).
* Improvements in space group detection (handles full H-M symbols).

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* Fixed security issues related to vectors/matrices input from the
command line.
* New interface: CP2K
* New interface: .coo files
* New interface: FHI-AIMS
* Minor fixes and tweaks

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