v1.11.1

Added

• Test pattern mode 5 ({"testpattern":{"mode":5}}): a still pattern written
  into the middle of the ISP, after sharpening, where the libimp reports it
  through OpenIMP_TestPattern_Supported(5) (caps.testpattern.isp_mid;
  OpenIMP c5fedf2a+, T23 so far). The WebUI shows it as the ISP stage of the
  test pattern banner.

Everything else as in v1.11.0.