No rendering of "Line style keyword arguments:"  list because of missing blank line and  mysterious unexpected identation error

ArrowItem: setStyle now combines new options with previously-set options.
AxisItem: fix minor exceptions

Import and py3 bugfixes for MultiPlotWidget
Add setMinimumPlotHeight method.

Merge remote-tracking branch 'termim/develop' into multiplotwidget-fix

Minor setup corrections

- Added FillBetweenItem.setCurves()
- Added FillBetweenItem example

- removes the tools/debian directory (re-added in debian branch)
- updates to setup scripts

Merge branch 'scatter-optim' into develop

added simple test

drawSymbol is module-level funct, not class method

Conflicts:
	pyqtgraph/functions.py
	pyqtgraph/graphicsItems/AxisItem.py

ImageItem.getHistogram is more clever about constructing histograms:
  - integer dtype images now have integer-aligned bins, with bin number
    determined by a target value
  - step size is automatically chosen based on a target image size
  - bins and step arguments have default values 'auto'

  - integer dtype images now have integer-aligned bins, with bin number
    determined by a target value
  - step size is automatically chosen based on a target image size
  - bins and step arguments have default values 'auto'

Merge remote-tracking branch 'anntzer/integer-image-histogram-range' into integer-image-histogram-range

When an ImageItem's data has an integer dtype, this patch ensures that
each bin of the LUT histogram contains the same number of integer
values, in order to avoid "spikes" in the histogram that are merely due
to some bins covering more integer values than others.

This commit needs testing (it was rebased from an old commit).