caught a typo in the arc-x4 booster algorithm and corrected pseudo+real code.
updated signature of arcfsBooster to allow for output to be used as input. (added ...'s.)
updated metaboostProc to funnel boosters output at iteration k into its input for iteration k+1.
fixed bug in predictClassFromVote where weights were not properly sized causing a 'non-conformable' array error.
updated aggregators to cast output as factor variables.
attached boosteroutput to returned weldr object in metaboostProc.
started implementing adaboost algorithms. Still need to be documented.
changed booster arguments to reflect design choice that 'probs' -> 'weights'
updated metaboostProc and wrote tests to make sure that metaboost can implement arc-fs, arc-x4 and adaboost.