Performance improvements and corner-case fixes.
This release changes the API to achieve better performance. Previous releases were about 60% slower than ArduinoPID (embarrassing!). This release, though it has reduced functionality, is about 30% faster than ArduinoPID. Also, extensive work has gone into verification. This PID controller is correct against my Python based reference for a broad range of parameter combinations.
You should switch to using this release ASAP. Sorry for the breakage!