Inkscape 0.48.1

* Exporting of masks has been substantially improved in all Cairo-based output formats.
* Several crash bugs in the node tool have been fixed.
* Rulers are redrawn properly with recent versions of GTK.
* Unlinking an orphaned clone no longer causes a crash.
* Problems with extensions sometimes not working at all on Mac OS X have been fixed.
* Inkscape should no longer crash due to missing icons at startup or when opening the document properties dialog.
* Shift-clicking on the top rounding handle of a rectangle will no longer cause a crash.
* Inkscape builds correctly with recent versions of Poppler.