RFR 8054461: Add @file support to sjavac

[Fredrik Öhrström]

I don't really like the idea of Sjavac.java:

>
>   * @summary Test all aspects of sjavac.
>
> Can't we try to have one test per feature / bug?
>

Indeed, see https://bugs.openjdk.java.net/browse/JDK-8054689
:-)
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