Count branch stats in the interpreter.

The log files for cjpeg and djpeg were 15GB when I killed the processes!
Use run/collect part of benchmark harness
CSV files from first run.
Flatten CSV directory.
Delete duplicate and broken data.
Basic CSV cleanup script.
Cross-validation script
Cross-validate several classifiers
.gitignore .pyc files and Release+Debug directories.
Eliminate branches which are never seen from training set.
Use log-loss as a measure of performance.
Measure number of correct predictions
Weight accuracy by how often branches are seen
Merge branch 'master' of github.com:pozorvlak/llvm-branchpred