#7 Fix for infinite loop in libqtpod-0.4.0

[Michael Schulze]

If a new track was created libqtpod tries to find an unused filename by using QDir::count() after setting
a nameFilter to the filename to check. This
seems to be broken for Qt4.3.2 and will result in an infinite loop.
This patch delivers a workaround for the problem and fixes a small glitch for win32 platforms where the filename for found for new tracks contains an invalid direcory.

[Michael Schulze]

Fix for infinite loop in libqtpod-0.4.0