ENH run_subprocess(): logging end error handling
FIX TEST: missing subjects_dir in test_label
FIX: run_subprocess()
FIX: add missing subjects_dir argument to test_forward
WIP ENH: Add TFCE
ENH: Add haircut support
ENH: Speeding up TFCE, cleaning up code
ENH: Faster
ENH: Adding example
STY: Cleanup
ENH: Adding more tests
FIX: Fix example
ENH: Better examples, testing, and fixes
FIX: Minor fix
ENH: Updating whats new
ENH: Better handling of bad thresholding
FIX:  test_forward
ENH: as_data_frame method for STC objects
CLN: refactor + standardize data_frame internals
CLN: add pandas checking function