Add a new test case: voltage diviser
Added menu entryes and slots for export entire schematic to image
Basic functions for export schematic to image
Schematic size calculation. Works wrong.
Basic correct export to PNG
Paintings added to export
Export Diagram Dialog adapted for export schematics
Valid image format checking was moved to exportdiagramdialog.cpp
Added schematic export to SVG. SVGs created during export now can be correctly opened by Inkscape
Added diagrams to export schematic
Added export export to image for selected area. Now it is need to unite ExportDiagram and ExportSch functions to one.
ExportDiagramDialog refactored to ExportDialog and exportdiagramdialog.cpp renamed as exportdialog.cpp, because this dialog is used now not only for exporting diagrams to images.
Slots slotSaveDiagramToGraphicsFile and slotSaveSchematicToGraphicsFile are united to one slot in file qucs.cpp
Added Scale line edit to Export dialog
Selected area size calculation was rewrited
Added paintings to image size calculation
Added Image Format ComboBox to Export Dialog
Removed some commented code and replaced some magic numbers
Methods for calculation size of image was moved to schematic.cpp
Removed some comments