Print via QPrinter when rasterizing and printing annotations
When the user chooses to print with rasterization and annotations, it is easy to print directly to a QPrinter, rather than converting to PostScript and then using CUPS tools. The code for it was already there, but it was hidden behind an #ifdef Q_OS_WIN. This patch enables it for all plattforms. If nothing else, it will make an interesting debugging tool, because it allows to bypass the postscript & CUPS toolchain from the GUI. This may allow to track down some of the numerous my-printer-settings- are-getting-ignored bugs. The previously windows-only rasterization code used printer.physicalDpiX() as the rasterization resolution. At least on my machine this resulted in a dpi value of 1200, which means quite a lot of memory is used. I left the windows code untouched, but on Unix I lowered that value to 300dpi, which is what the postscript rasterizer uses. Incidentally, this patch does fix at least one bug for me: Without it, my printer will happily ignore the 'print in grayscale' button. With the patch, that button is suddenly honoured. REVIEW: 130218
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