Add scripts as an image format (since it's trivial to do).

Avoid returning errors for comments and empty lines.

after a call to load().

returns the allocated buffer.

"kernel".

alignment.

userptr_add().

it if we don't.

refer to them by name from the command line, or build them into a
multiboot module list.

Use setting image->type to disambiguate between "not my image" and "bad
image"; this avoids relying on specific values of the error code.

information table yet).

to the REAL_CODE interface.

as allocated by malloc()) versus all other errors, in particular
ENOBUFS (representing a lack of external buffer space, e.g. in a
device's TX queue or a user buffer).