Search: Metadata keys with "-" in name do not work

[dvstans]

The query compilation code is probably mishandling key values and the "-" may be being treated as a minus operator. This is failing in the catalog search,

[dvstans]

Must restrict allowed characters in schema/metadata property names. Only 0-9, a-z, and a few special characters. Must add check for this during schema and metadata validation.

[dvstans]

After testing via AQL, only a-z, A-Z, 0-9, ans underscore can be used. Also, a variable cannot start with a number and is it starts with an underscore, the first non-underscore character must not be a number. The DataFed documentation needs to be updated to reflect theses restrictions.

[dvstans]

Not fixed - can create records with bad keys in metadata.