Hello Amalog

hello.ama

use("amalog.org/std/io", Io); # See Note_use

main(W) {
    Io.printf(W, "Hello, world!\n");
}

### Note_use:

`use/2` is a macro that expands into

    at(now) {
        Core.load("amalog.org/std/io", Io);
        Core.make_global(Io);  # only callable at compile time
    }
    
where `at/1` schedules execution at the runtime stage indicated.
`now` is "as soon as possible during compilation".

`use/2` has to be a macro because `Core.make_global/1` has
to operate on the variable itself not an alias.

`load/2` parses a directory of Amalog files into a database.
###