issue 8200: new proposal

Per my AI, here's an amended proposal for 8200:
- remove the "...-mex-all" Dialect URI from the Identifier table and the 
Metadata Format table 
- for the definition of the ..-mex-all dialect, replace:
This value returns all known metadata. The endpoint has the option to 
optimize the format in which it returns the data. 
with:
This special dialect IRI indicates that all known metadata dialects are to 
be returned.  This Dialect IRI is meant to only be used in GetMetadata 
request messages, not as a Dialect IRI in a mex:MetadataSection element, 
as there is no actual metadata format associated with it.  The endpoint 
has the option to optimize the format in which it returns the data.

thanks
-Doug
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