#301 Need pragma.syntax/1 support

[Mark Samuel Miller]

See
http://www.eros-os.org/pipermail/e-lang/2006-July/011397.html

Beyond what's currently implemented in E-on-Java, we
need some simple way to express, in the E source tree,
that "version Y is just like version X".

[Mark Samuel Miller]

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As of E 0.8.37b, we've adopted a simpler solution that uses
the current mechanism:
We're defining a major version to only include the first two
digits, such as "0.8".
We declare a file as in a particular major version, so we
only need syntax-props
files per major version. Major version changes are
significant enough that this
is maintainable with no extra mechanism.