Improve baselines, weight sampling, plots, early stopping implementation

Baselines:
- matching and cycle cover baselines removed from experiments
- sampling baseline implemented and added to experiments

Weight sampling:
- added option to have weights not drawn independently
- generated plots with dependent weights

Plots:
- removed upper bound line
- made labels more accurate
- removed legend from early stopping plots

Early stopping:
- changed n from 40 to 60 for experiments
- same set of graphs are now used for different values of `lim`
for more consistent results in experiments