Applied Christian Ehrlicher's patch, fixing a potentially invalid access of
freed memory in handle_events (spnavd.c) when disconnecting a USB device.


git-svn-id: https://svn.code.sf.net/p/spacenav/code/@175 ef983eb1-d774-4af8-acfd-baaf7b16a646
Applied Christian Ehrlicher's patch, fixing a couple of memory leaks in the
linux usb device detection code.



git-svn-id: https://svn.code.sf.net/p/spacenav/code/@176 ef983eb1-d774-4af8-acfd-baaf7b16a646
added more 3d connexion usb device ids to the detection routine


git-svn-id: https://svn.code.sf.net/p/spacenav/code/@177 ef983eb1-d774-4af8-acfd-baaf7b16a646