lxi-tools v1.6

Changes since lxi-tools v1.5:

• Add date-time stamp to screenshot filename

• Improve command handling

  In case of a misspelled command the tool would misleadingly
  respond: "Error: No IP address specified"

  With this fix, it now responds: "Error: Unknown command"

• Update README

• Added screenshot plugin for Tektronix 2000 series scopes

• Improve scpi response output

• Add --raw and --raw-port options to scpi command

  One can now use choose to use raw/TCP instead of VXI11 when firing SCPI
  commands. Simply append the --raw option like so:

  lxi scpi --raw --address 192.168.0.42 "*IDN?"

  By default raw/TCP port 5555 is used but it can be changed using the
  --raw-port option.

  Warning: Using raw/TCP is faster than VXI11 but does not provide any
  timeout/control mechanisms so if your command somehow stalls it will
  stall forever.

• Use new lxi_connect() function

• Cleanup

• Make screenshot filename optional

  In case no screenshot filename is provided the tool will write the
  screenshot image to an automatically resolved and incremented filename
  on the form screenshot-###.. For example, screenshot-000.png,
  screenshot-001.png, etc..

• Improve screenshot model listing

• Increase default timeout for screenshot command

  Transferring screenshot image data takes time so lets increase the
  timeout so we do not easily interrupt a good but slow transfer.

• Collapse Rigol screenshot plugin

  Support all Rigol oscilloscope models via one model name.

• Add screenshot support for Keysight IV 2000 X

• Cleanup plugins

• Add screenshot support for R&S HMO1000 series

• Add screenshot support for Rigol 2000/4000

• Create directory for screenshot plugins