This version just fixes some bugs in 1.9.0.
Specifically, version strings were wrong in some
places and textures would not be reloaded after
deleting all cameras (OpenGL MG-backend). Images
in the HTML version of the manual are now
accessible from within the non-installed manual in
the build-tree, and the in-build-tree manual now
resides in BUILDDIR/doc/htdocs. Previously, the
HTML version would only be complete when make
install was done.