HDATA — Simple search

To support simple searches over Sections and the entire record, for
the section 6.2 and
6.4, the following URL structure is reserved:

5.1. (baseURL)/search?(queryParameter)

This allows a search over the entire record. The (queryParameter) can
be arbitrary,
but it is RECOMMENDED to use HTTP form-encoding style key/value parameters.
The server returns the results of the query in the form of an Atom
feed, with each Entry
representing a search result.

5.2. (baseURL)/(sectionPath)/search?(queryParameter)

The semantics for this query are identical to the one in 4.1., but the
scope is limited to
the section described by the sectionPath.

Created new section 6.6 to implement requested capability.
Added section 6.3.3