SNS Scan system: ScanErrorHandler...
Scan system: Error handling examples (continue, retry-then-continue,
retry-then-abort)
Scan system: One Jython interpreter per scan
Scan system: Test failed

Loop command with "" readback device will use loop's main device for
read back. No need to set the readback device name for this.
Scan server: Update tests
Scan System: Error handler online help
Merge remote-tracking branch 'origin/scan_error_handler' into 3.2.x