SciDAVis - Improvements SVN-temp

- Some refactoring which is supposed to reduce the risk of corruption as in bug #2785609.

- Inserted some sanity checks related to bug #2785609 in order to prevent crashes caused by giving
invalid arguments to Table::text() and Table::cell().
- Inserted and improved some sanity checks in Graph in order to catch corrupt data in the first
place. Guaranteeing data integrity is difficult though, due to lack of encapsulation in the Graph
API and code duplication between Graph::insertCurve(), Graph::setLabels*Format() and
DataCurve::loadData().

- Improved performance of filling large columns with row numbers and random values.

- Removed unused Table::columnNumericFormat() methods (small code cleanup).

- Improved performance of column formulas for large tables (fixes part of bug
#2778891).

- Changed filename of Windows installer to include the platform we're currently building for (win32).

- Added Brazilian Portuguese translation to Windows installer.
- Fixed run path of shortcuts generated by Windows installer.

- Added some missing tr()'s, and lupdate'd translations.

- Fixed crash when trying to acess non-existing column via MuParserScript.
- Improved pasting of cells from OpenOffice.org Calc and KSpread into tables.

- Brazilian Portuguese translation update; thanks to Fellype.