New version: FiniteMPS v1.6.0

[JuliaRegistrator]

• Registering package: FiniteMPS
• Repository: https://github.com/Qiaoyi-Li/FiniteMPS.jl
• Created by: @Qiaoyi-Li
• Version: v1.6.0
• Commit: 0b3855e4699fc676c4fb9d709ba926b540c369a2
• Reviewed by: @Qiaoyi-Li
• Reference: Qiaoyi-Li/FiniteMPS.jl@0b3855e#commitcomment-150840982
• Description: Provide some MPS-based algorithms such as DMRG and TDVP.
• Release notes:

### Breaking changes
- Rewrite `addIntr!` and `addObs!` and change the interface. For example, consider a hopping term, now the usage becomes
```julia
addIntr!(Root, (Fdag, F), (i, j), (true, true), strength; Z = Z)
```
where `(true, true)` means both operators are fermionic.  Similarly, 
```julia
addObs!(Tree, (Fdag, F), (i, j), (true, true); Z = Z)
```
for the calculation of single-particle correlations. 
- Now a multi-site correlation with duplicated site indices can automatically reduce to a shorter term. For example, in the case of $U_1 \times SU_2$ symmetry, the pairing correlation $\langle \Delta_{12}^\dagger \Delta_{23}\rangle$ can be simply calculated via 
```julia
addObs!(Tree, U1SUFermions.ΔₛdagΔₛ, (1, 2, 2, 3), (true, true, true, true); Z = U1SUFermions.Z)
```
- Support adding 3-site terms, e.g. chiral operator $S_i \cdot (S_j \times S_k)$ pinning field, to the Hamiltonian.

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