DONE:
* activate AsciiFilterTest::testHeader08()
GENERAL:
* validate https://bugs.kde.org/show_bug.cgi?id=413384
* Import datetime data including 29.2.
* Fit datetime data fails atm
* Windows
* failing ASCII, JSON and project import tests (see build.kde.org)
* implement the interruption of running calculations in Maxima, borrow the code from wxMaxima for this
2.9
* add KUserFeedback on Windows and Mac
Links:
* Windows port: T3118
* Mac port: T3196