Patch: perform autoloading when docs is missing from autoload object

[Arthur Miller]

I would like help functions to autoload files when help on symbols is
requestd. Built-in help do that only in limited cases, while helpful dutifully
loads libraries when symbol is not loaded. I would actually prefer to just load
documentation not the entire library, and I think I can do that, but it is a
little bit more involved (have to find source and read the docs), unlike just
performing autoloading.

About the patch: there is already an help-enable-autoload option for built-in
help, probably meant to do exactly what I want, but it is much more savvy what
it loads (only kemaps I think?).

I have introduced new variable, help-enable-symbol-autoload, and more aggressive
autoloading will be performed only when this one is set to 't, so it is an
opt-in option. I would gladly skip that extra variable and use original one, but
that would turn it into opt-out option which might not be desired by everyone.

I am not sure if understand exact usage of built-in help functions, but the
main entry should be describe-* functions, and this should only affect those? I
am little bit unsecure here.

I have two versions, I prefer the first, help-fns.el only one, but as said,
I am a bit unsure how help functions are used, so I have attached an alternative
too. To note: this is only for functions, I am not sure if it is needed for
variables?

It is just a proposal.

Best regards
/a

0001-only-help-fns.patch
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0002-with-help.el.patch
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