Merge pull request #558 from mluessi/fix_con_psi

FIX: Use rng seed, update what's new
misc
ENH: Use codespell
FIX: Minor fix
Merge pull request #561 from Eric89GXL/codespell

ENH: codespell support and related fixes
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