This moves the header files to a new subdirectory gphoto2 in both libgphoto2 and libphoto2_port/libgphoto2. All references are adapted appropriately. git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@9221 67ed7778-7388-44ab-90cf-0a291f65f57c