tweaks
Support for top 90% LL score

- Added: Compute top 90% summed Loglikelihood, instead of full one. Allows for some errors, check how parameters change.
Generators for 90% LL CMA-ES optim.
Generator for T in [2, 5]
Safer CHDIR command

- Add: there were weird behaviours during CMA-ES + live_function_callbacks calls with resubmission. So now when changing directory, tells you where you are now, safer. Can be disactivated.