autocompilation support in master

[Andy Wingo]

Hey folks,

I pushed support for automatic compilation in master. That is, whenever
load-from-path sees that it should compile a file, and autocompilation
is enabled, it compiles the file then and there.

I went ahead and enabled this feature, to see exactly what kinds of bugs
this will cause.

There's a lot of trickiness to this, but I think we all have instincts
on how this should work. I'll write docs soon, but in the meantime, I
would like for folks to ignore the implementation, and just use Guile
for a while, and see if what it does sounds right to you. It prints some
status info on the console when autocompiling.

Of course, after the gut reaction, I would appreciate implementation
criticisms as well :)

Regards,

Andy
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