Documentation:

• Describe material profiles in more detail.
• Describe automatic material profile measurement, determine *into-air* and *printing* volumetric flowrate data.
• Update section about temperature-limiter.
• Update section about flowrate-limiter.
• Added more pictures and data plots.

Code fixes:

• Auto-temp: fix "workingpoint" commandline parameter, it worked the wrong way.
• Preload: test another way to compute amout of data to pre-download to the printer, simply count small moves.
• Some cleanup.