Labplot master branch build failures

[Stefan Gerlach]

Thanks for reporting. I will fix this asap.

> Restoring:
>
> #include <cmath>
> in src/backend/core/AbstractColumn.h
>
> &
>
> #include <QVector>
> in  src/backend/matrix/MatrixPrivate.h
>
> https://paste.kde.org/phftxuwzm
>
> superficially at least, fixes the build for me.
>
> My C++ and familiarity with this code is a little bit too flaky to
> comment on whether this is ok in other respects.
>
> Thanks
>
> On 13/06/17 10:01, Rik Mills wrote:
>> Bisecting locally building with GCC6, culprit or 1st bad commit seems to be:
>>
>> https://cgit.kde.org/labplot.git/commit/?id=d220081a978788c67ea99749c4c56176aaa2a7a1
>>
>> On 13/06/17 09:41, Rik Mills wrote:
>>> Seems to fail with GCC 6, but succeeds with GCC 5.
>>>
>>> Failures on GCC6:
>>>
>>> artful http://kci.pangea.pub/job/artful_unstable_labplot/45/
>>> zesty http://kci.pangea.pub/job/zesty_unstable_labplot/52/
>>>
>>> make[3]: *** [src/CMakeFiles/labplot2.dir/kdefrontend/GuiObserver.cpp.o]
>>> Error 1
>>> make[3]: *** Waiting for unfinished jobs....
>>> In file included from
>>> /<<BUILDDIR>>/labplot-2.4.0+p17.10+git20170613.0754/src/backend/spreadsheet/Spreadsheet.h:33:0,
>>>                  from
>>> /<<BUILDDIR>>/labplot-2.4.0+p17.10+git20170613.0754/src/kdefrontend/MainWin.cpp:36:
>>> /<<BUILDDIR>>/labplot-2.4.0+p17.10+git20170613.0754/src/backend/core/column/Column.h:
>>> In constructor ‘Column::ColumnStatistics::ColumnStatistics()’:
>>> /<<BUILDDIR>>/labplot-2.4.0+p17.10+git20170613.0754/src/backend/core/column/Column.h:46:15:
>>> error: ‘NAN’ was not declared in this scope
>>>      minimum = NAN;
>>>                ^~~
>>> src/CMakeFiles/labplot2.dir/build.make:372: recipe for target
>>> 'src/CMakeFiles/labplot2.dir/kdefrontend/MainWin.cpp.o' failed
>>>
>>> Success on GCC 5:
>>>
>>> xenial KCI http://kci.pangea.pub/job/xenial_unstable_labplot/55/
>>>
>>> and for ref on other CI using GCC5
>>>
>>> xenial NCI
>>> http://build.neon.kde.org/job/xenial_unstable_kde-extras_labplot/41/
>>> KDE CI https://build.kde.org/job/labplot%20master%20kf5-qt5/180/

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