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also fixes save/load of datetime range properties in the plot.

first histogram for datetime data was added.

[histogram] properly restore the saved values column in the histogram and also save the values formatting properties.

[spreadsheet] extended the statistics dialog by showing more information in addition to the descriptive statistics we have right now - histogram, boxplot, etc.  At the moment only the histogram is implemented and we'll additional content step by step.

all its children. This allows to remove the "bad hack" in XYCurve to be
aware of deleted columns when the parent spreadsheet is being deleted. This
is also more generic now and applies for other "curves" like the
histogram, too. So, the histogram is now also properly reacting of
spreadsheet or workbook deletions.

changes to avoid code duplication and made this logic more complete by
taking also the value columns in the curves into account.

parsed when doing the preview of a project to be imported. We pre-load
only those objects that are relevant to check the dependencies across
the project.

1. fixed compile error when building without HDF5 lib
2. removed unnecessary test file

[import] #ifdef the different file formats in AbstractFileFilter::fileType() so we don't try to parse for example a netCDF file when the application was compiled without any support for netCDF.

ImportProjectDialog.

1. react on TextChanged instead on ReturnPressed in HistogramDock.
2. removed unneeded member in ReferenceLine.
3. new signal-slot syntax in XYEquationCurveDock.

and not via QPainter::drawPath() in oder to get the text exported as
text in SVG and not as a polygon.

change for values prefix and suffix and not on return pressed event.

BUG: 431535
FIXED-IN: 2.9

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

text of the y-axis to "Frequency" and some refactoring in
PlotDataDialog.cpp to have more re-use of the common code.

the breeze theme since the reverse order is better fitting into what
we're doing in the worksheet layout with this. The icons were changed
already in the main toolbar and we need to change them also in the
worksheet properties widget where the layout type can also be modified.

implementation is the same for  all worksheet elements.

on the undo stack in case the symmetric padding is used.

[worksheet] improved the calculation of the bounding box of the plot when the selection box has to be drawn. Still not optimal, will be replaced by a different solution later.

the lines of the different mouse cursor modes like zoom&select and
crosshair to avoid situations where we're drawing black lines on the
black plot area.

1.  show the full context menu of the worksheet in the view including the base actions like rename,  delete,  copy&paste,  etc.  so the user is able to perform them directly in the view,  too.
2. properly handle the copy&paste of the info elements

Allow to copy&paste custom points,  reference lines and info elements and some cleanup in CustomPoint.

Show an error message in a message widget in the project explorer in case the copied object cannot be pasted in the currently selected object (because of the incompatible types).

under the same parent).