Consecutive regression runs crashes software

[tjrocha]

Fix issues when running consecutive regression runs. 1st regression run works fine but consecutive regression runs with the exact same settings after the first runs slower and eventually crashes the program. Might be an issue with how arrays/objects are being initialized during each regression run.

Issue can be reproduced by running any regression (MLR, PCA, ZSCORE) consecutively with any feature selection algorithm (SFFS, SFBS, BruteForce) one right after the other. Issue is most evident with the BruteForce selection algorithm.