Add optional namelist / parameter dump for debugging and reproducibility

[aoymt]

Summary

This pull request adds routines that print effective namelist and related control variables to standard output (typically unit 6), gated so only rank 0 writes in parallel runs. The intent is to make it easier to verify which parameters a given binary actually used and to improve reproducibility when sharing logs.

What changed

Core implementation

• src/m_common/allio.f90: Introduces a family of dump_parameters_* subroutines (e.g. simulation, pseudo, readio, VMC, DMC/LRDMC, optimization, unused, link, fitpar, dynamic, k-points, molecular, and related groups) that echo the corresponding variables with clear section headers.

Read data

• src/b_complex/read_datas.f90: Adds a section-aware dump_parameters entry point (and related wiring) so dumps can be tied to named input sections where appropriate. This file also contains a substantial refactor alongside the new dump calls.

Call sites

• Invokes the new dump logic from key programs after input is parsed or setup completes.

Behavior notes

Output is intended for human-readable logs; expect verbose stdout when these paths run. If this becomes noisy for production, consider guarding dumps behind a namelist flag or compile-time option in a follow-up.