[Doxygen-develop] Disable "generated on" text in HTML footer by default

[Michal S. <ms...@su...>]

Hi!

There is a problem with same packages which are build in different time
and which use doxygen to build doc part
This "generated on" feature in HTML footer causes diff in doc part,
which is not easy to recognize as "real change", so it's problem to
check if generated package was really changed or not
I know there is a option to fix this issue through the HTML_FOOTER, but
for build system which build hundreds of open source packages
 you need to patch each package separately
So I want to know if disable "generated on" by default is right and if
would be possible to fix it

patch attached,
http://bugzilla.gnome.org/show_bug.cgi?id=579303

thanks
Michal