v1.11.2

Enhancements:

• Update the introduction to tensor contraction docs
• Improve efficiency of 1D structured contractions when default optimize is used.

Bug fixes:

• fixes for MPS and MPO constructors when L=1, (#314)
• tensor splitting with absorb="left" now correctly marks left indices.
• tn.isel: fix bug when value could not be compared to string "r"
• truncated svd, make n_chi comparison more robust to different backends

Full Changelog: v1.11.1...v1.11.2