This patch is just adding a single header, but because it also modifies
all the C files to add the #include, it was made as a patch on its own to
ease review.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Big files are harder to work with, so split load and save, which
happen to already be independent anyway.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>