Qmm

Fixed
- Remove a `print("here")`.
- Small docstring typo fix.

Changed
- Rename `calc_fun` to `calc_objv`.
- Add `calc_objv` argument to lcg.
- Fix `lcg` second member update.

Fixed
- Fix `pcg` exposition.

Changed
- Add docstring for pcg.

Changed
- Remove `calc_fun` for `lcg` since the overhead is very small

Added
- Add `pcg`, similar to `lcg` with a differente API.

Changed
- Docstring and documentation fixes.
- Update to maximum 3.11 python verion.

Added
- The list of data feature has been factorized in a 'Stacked' class.
- QuadObjective computes lazily the second term and the constant.

Changed
- Docstring and documentation fixes.

Added
- Add the Geman and Yang coefficients

Changed
- Small fix and refactoring