Fixup Mac toolbar for Qt5 and Qt4 build

.. should be a bit better now.
Revert "Fixup Mac toolbar for Qt5 and Qt4 build"

This reverts commit 20739ebb2913c22f677988516e25fd1c3e3362a5.

Qt5 has a number of issues that cannot easily be resolved.

An alternative strategy of developing a custom cocoa control
for the mac toolbar is probably a better way forward.
Add <QMessageBox> to ExtendedCriticalPower.cpp
AllPlot Stacked by Series

Extending the stack display to have a single plot for each
data series. This will be useful when comparing activities
and also makes it a bit easier to see the data when there
are lots of data series.

This is a checkpoint commit as I need to fixup some of the
series that have multiple curves and also reference lines
are not currently working.

But you can zoom using the fullplot and highlight intervals
etc.
Remove errant qDebug statements
Update website for 3.0.1 release
Merge remote-tracking branch 'upstream/master'