This is still a work in progress, but this commit adds
yaehmop with band structure calculations. It runs, but
several features (especially in the GUI) still need to
be coded.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

This allows for both custom tick marker positions and custom
tick marker labels.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Unfortunately, some unicode characters (such as Greek characters)
do not currently work. When we add a font to VTK that can display
unicode characters, we can start using the unicode gamma.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Data will, in the future, be save-able via a button on the plot.
This makes the 'display data?' buttons obsolete.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

This can save time if a plugin wishes to attempt to use a cached
space group rather than determine it algorithmically via spglib every
time it is needed.

This can also enable use to put space group information in the corner
render window of a crystal if it is desirable.

All of the information about a space group (the crystal system,
international number, schoenflies symbol, hall symbol, international
symbol, etc.) can be determined with just the hall number
(functions to do these are in avogadro/core/spacegroups.h).

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

This commit enables special k points to be generated automatically
using the space group of the crystal. It will first attempt to use
the cached space group, and if that does not exist, it will attempt
to use spglib to determine the space group.

It seems to work in all of the standard test cases that I tried.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

…m/psavery/avogadrolibs into yaehmop-added

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

This enables the user to select the axis for the custom tick
labels.

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>

Signed-off-by: Patrick Avery <psavery@buffalo.edu>