[PATCH/RFC] Add separate error code for RA Forbidden

At the moment a generic error (175002, SVN_ERR_RA_DAV_REQUEST_FAILED) is
returned when ra_neon hits a 403 error, and this makes it hard to
distinguish it from other RA errors that also return 175002.

[[[

 * subversion/include/svn_error_codes.h: Add error code
SVN_ERR_RA_FORBIDDEN.
 * subversion/libsvn_ra_neon/util.c(generate_error): Return
SVN_ERR_RA_FORBIDDEN for 403 HTTP codes.

]]]

Is SVN_ERR_RA_FORBIDDEN the right name here and RA the right category,
or does it belong in the DAV specific error category?

Cheers,

Jelmer

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