Introduce an option for disabling the automatic resolver in FileSourceFile#133

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eisterman wants to merge 3 commits intorust-cli:mainfrom

eisterman:file_resolver_option

Commits on Mar 14, 2020

Use the same message format of the "File not found" error
eisterman
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Add an option to disable the automatic file format resolution for FileSourceFile
eisterman
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Commits on Mar 15, 2020

Change method name File::exact_name to File::exact
eisterman
committed