* Makefile.am: Improve generation of headers.mk.

	* demo/Makefile.am: Fix an invalid path to the .pro file.

	* demo/src/main.cc: repair copyright header.

	* demo/src/mainwindow.cc,
	* demo/src/mainwindow.hh: handle a different base directory for image
	data.

	* filter/small_objects.hh: fix an accumulator.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@4105 4aad255d-cdde-0310-9447-f3009e2ae8c0