Milena: Do not look for headers in the build tree uselessly.
* tools/tools.mk (AM_CPPFLAGS): Remove Milena's build dir from the file inclusion path. Remove outdated FIXMEs. * apps/constrained-connectivity/Makefile.am, * apps/graph-morpho/Makefile.am, * apps/mesh-segm-skel/Makefile.am, * apps/morphers/Makefile.am, * apps/papers/levillain.09.ismm/Makefile.am (AM_CPPFLAGS): Explain why $(top_builddir)/milena is part of the file inclusion path. * apps/generic-skel/Makefile.am, * doc/Makefile.am, * tests/tests.mk (AM_CPPFLAGS): Uniformity changes.