v0.9.0

ITensorBase v0.9.0

Diff since v0.8.7

Merged pull requests:

• Improve user-facing docs and reject indices passed as dimension names (#192) (@mtfishman)
• Make NamedTensor the primary tensor type, ITensor an IndexName alias (#193) (@mtfishman)
• Return the indices from inds as a Vector, keep axes a Tuple (#194) (@mtfishman)
• Store IndexName tags as a sorted symbol dictionary (#195) (@mtfishman)