v2.1.1

A one-bug hotfix for v2.1.0, which has been pulled from the update feed.

Bug fixes

Attach To Process no longer crashes when more than one document is open.
Every document presented the same shared controller instance, and a view
controller can only be presented from one window at a time — opening Attach
To Process in a second document while the first still had it on screen
brought the app down. Each document now gets its own sheet.

One behavior goes away with the fix: the picker no longer remembers the
last-selected tab and running row across reopens.

From v2.1.0 — no migration steps, and no helper reinstall. The privileged
helper's protocol version is unchanged, so the daemon v2.1.0 installed keeps
running.
From v2.0.x — everything in the
v2.1.0 release notes
applies, including the one-time helper reinstall on first launch.