Made DOE deterministic, recovered missing input files and fixed a bg

[zurabksmlp]

1. Made DOE deterministic so regression tests 34 to 45 should become reproducible.
   The master files have been updated.

2. Created missing DOE specs for tests 145,146,205 and added respective master files.
   These new DOE specs are:
   regr_smlp/grids/doe_two_levels_opt.csv
   regr_smlp/grids/explore_doe_two_levels.csv

3. Added random seed in DOE related regressions tests, in smlp_regr.csv where it was missing.

4. Fixed a bug in single-objective optimization calls detected in tests 145, 146, and 205.

5. Code changes are in:
   smlp_refine.py
   smlp_doe.py
   smlp_flows.py
   smlp_optimize.py

[mdmitry1]

1. In my regression now only two tests are crashing: Test104 and Test107
2. As happened with PR fix for support for eta constraints in spec file #152, I was not able to reproduce all results in the PR.
   In this case I've got different results for Test146.
   Therefore I believe we need to wait until @fbrausse will run testing on his machine.
3. Masters for the below files are probably not updated, as content diff has been reported in my run:

Test9_smlp_toy_num_resp_mult_smlp_toy_num_resp_mult_pred_labeled_args_config.json Failed -> content diff
Test31_smlp_toy_num_resp_mult_args_config.json Failed -> content diff
Test87_smlp_toy_num_resp_mult_rerun_model_config.json Failed -> content diff
Test92_smlp_toy_num_resp_mult_rerun_model_config.json Failed -> content diff
Test123_smlp_toy_basic.txt Failed -> content diff
test20_model_rerun_model_config.json Failed -> content diff
test19_model_rerun_model_config.json Failed -> content diff
test22_model_rerun_model_config.json Failed -> content diff
test24_model_rerun_model_config.json Failed -> content diff
test26_model_rerun_model_config.json Failed -> content diff
test63_model_rerun_model_config.json Failed -> content diff
test69_model_rerun_model_config.json Failed -> content diff
test101_model_rerun_model_config.json Failed -> content diff
test103_model_rerun_model_config.json Failed -> content diff
test110_model_rerun_model_config.json Failed -> content diff
test113_model_rerun_model_config.json Failed -> content diff

Build 80
Regression results