Unfolding a reduced list

[glwhart]

Would be nice to add some utilities:

• Unfold a reduced list
• compare two kpoints, see if equivalent
• Put all kpoints in the BZ (instead of first unit cell). (Is accuracy increased when the shortest k-vectors are used, after all the bands aren't really periodic for a finite basis set...)
• Find irreducible wedge of BZ

...

[glwhart]

• Put all kpoints in the BZ (instead of first unit cell). (Is accuracy increased when the shortest k-vectors are used, after all the bands aren't really periodic for a finite basis set...)

This one has been included in the code now.