[Wien] bugfix - large number of bands in wien2wannier

[Jindrich Kolorenc]

Dear developers,

I observed (silent) crashes of wien2wannier for a large system
(a supercell with an adatom on a surface). Looks like it is due to
a hardcoded and unchecked assumption there there are at most 1000 bands.
I attach a patch proposal that uses an allocatable array.

Best regards,
Jindrich Kolorenc
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