Fix inconsistency in sympy symbols in Models

Dániel Varjasrequested to merge
ham_gen_fix into stable-1.2

There are multiple things here, might want to break this up into multiple MR's.

  • Fix #15 (closed) by removing copy(key) in Model.

  • Fix a related error in the kwant.qsymm tests by removing the real=True flag in hamiltonian_from_family.

  • Refactor bloch_family to avoid unnecessary conversion between Model and BlochModel (as it turns out this had nothing to do with the bugs, but make the code nicer).

Edited by Joseph Weston

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