fix parameters when enable -best, parameters can still be overwritten when asked

[shajoezhu]

• seed
• sigma
• number of samples
• burn rate

[shajoezhu]

-sigma 1.6
-vqslod 8
-k 4

-nSample 500 -rate 8 -burn 0.67 -sigma 2.0 -vqslod 8

see #284

[shajoezhu]

sigma as 1.6 or 2, needs to be decided. will need to rerun the github action to determine