[patch] Delete unnecessary generality in loadFile

[Rafael Espíndola]

loadFile can load mulitple files just because yaml has a feature for
putting multiple documents in one file.

Designing a linker around what yaml can do seems like a bad idea to
me. The attached wip patch changes it to read a single file. It also
updates one test to show the difference.

OK with the remaining tests updated?

Cheers,
Rafael
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