v0.5.0

Adds

• [open-chromatin] Adds open chromatin prediction subcommand for 6mA MTase-treated DNA
• [all] Fallback to ML 254 when threshold is estimated as 1.0

Changes

• [all] Refactor to workspaces
• [modbam, check-tags] Adds --head <n> option to take first n reads

Fixes

• [stats] Allow BED5 input regions and header/comment lines