Provide Helm commands and sources for Purpose. Features: - helmize all Purpose commands - special helm commands: + `helm-purpose-switch-buffer-with-purpose': same as `helm-buffers-list', but only list buffers with a specific purpose (default: same purpose as current buffer). + `helm-purpose-switch-buffer-with-some-purpose': choose a purpose, then call `helm-purpose-switch-buffer-with-purpose'. + `helm-purpose-mini-ignore-purpose': same as `helm-mini', but ignore Purpose when displaying the buffer. Setup: Call `helm-purpose-setup' in your init file. It will helmize all Purpose commands, but won't change any key bindings. Alternatively, you can set `purpose-preferred-prompt' to `helm' instead. Key Bindings: `helm-purpose' doesn't bind any keys, you are free to define your own bindings as you please.