bug#19603: 24.4.51; Improve emacs startup message.

[Stefan Monnier]

>> Maybe the best option is to emit some
>> message at startup in the following case:
>> - there are packages installed.
>> - the .emacs file is non-empty.
>> - there is no call to package-initialize in the .emacs file.
> But deferring packages initialization till after the init file has been
> loaded is a valid strategy.

It interacts poorly with hand customizations in ~/.emacs which typically
assume/need the packages to be initialized.

Note that the equivalent initialization (i.e. loading the autoloads) is
done (long) before loading the .emacs file for all the built-in packages.


        Stefan