SciDAVis - Improvements SVN-temp

- Fixed evaluation of col("name_with_underscores") with muParser.
Closes bug #2804435.

- Fixed recalculation of a subset of rows (deselected cells in the same column
were filled with zeroes).

- Made sure that error messages of column formulas are displayed only once (any
error condition during evaluation now aborts all further evaluations).
Closes bug #2795575.
- Fixed a memory leak in Table::recalculate(int,bool) (colscript was never
deleted).

- Implemented save/restore of the main window's geometry between sessions.
Closes feature request #1981334.

- Added sanity check to Graph::updateCurvesData(). If one of the columns of a
DataCurve changes type, remove the curve instead of crashing when trying to
update the axis format in DataCurve::loadData(). Closes bug #2802185.

- fixed bug #2802095: Crash when adding error bars with empty columns

- Changed file saving on Windows to remove files before replacing them, since
Windows doesn't support atomic rename. Closes bug #2797508.

- Added some sanity checks to prevent crashes when trying to plot from invalid
table/column using Python.

- Added planck_wavelength fit plugin.

- Some build system fixes for building on MacOS X Tiger.
- Fixed small type on scidavis.pro.