Added ALL the open babel files

For now, I'm including everything from the GUI install & everything from the
BABEL_DATADIR.

I want to avoid any external dependencies. Installing the Open Babel GUI also
installs some data in a separate folder and sets up an environment variable to
reference its location (BABEL_DATADIR), but I don't want this app to depend on
Open Babel being installed. (For a start this rules out deploying it on any
PaaS where I don't have that sort of control over the environment.)

There's a LOT of files - I won't need them all so I may come back and see which
ones can be removed.

(Also removed the nunit.framework.dll from the 3rdParty folder - that didn't
need to be there.)
Link to ALL open babel files in the project...

...and set their properties so that they get copied to the output directory.

This is easier to get working with PaaS deployment compared to using a post-build
event. It does make the project a bit messy so I'm going to come back and see
if I can tidy this up (by moving them into a project folder, for example).
Use the obabel command line exe for generating the 3D molecule from SMILES

I couldn't get the OBDotNet wrapper to work properly without the Open Babel GUI
installed on the machine. (And I don't want to have to rely on this dependency.)

I may come back and have another go at this, because it's much more convenient
to work with the OBDotNet wrapper (not least, because of having to fiddle with
the current directory in MoleculeBuilder.FromSmiles) but for now, this works
without any external dependencies.

The Mol format is fairly easy to read so I set the exe to output in that format.
I've re-introduced the LineReader and MolReader to read the output.
Clear the default pages before setting it

This caused problems deploying to azure websites