Merge pull request #2 from i2000s/master

Fix typo in `creationop`.
Use vectors to store the coefficients in QuStateVec and QuState.
Merge branch with changes of the coefficient storage.
Fix error in lindbladsuperop et al regarding the calculation of indices (rows and columns were interchanged).
Allow complex t in expmv.
Merge pull request #2 from acroy/master

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