-lststr
template: ster?clnt=<name|pass>&com=lststr&str=<str_pattern>[&mod=<mod_pattern>]
          Order of query params is not important. Query parameter
          'mod' is optional, if omitted defaults to '*'.
pattern : for stereotype, * | name
          For mode, * | p | u
descript: lists the stereotypes in the DB. From an original set of
          the stereotypes that match the stereotype pattern (that
          is, all stereotypes if str pattern is '*', a single
          stereotype if <name> exists in table 'stereotypes', or
          none if <name> does not exist or table is empty. A subset
          is selected and listed as follows: (a) if the mode pattern
          is '*', all stereotypes in the original set are returned
          without additional filtering, (b) if the mode pattern is
          'p', only the stereotypes of the original set that do not
          have any associated feature (do not exist in table
          'stereotype_profiles') are returned, and (c) if the mode
          pattern is 'u' only the stereotypes of the original set
          that have not been assigned to any user (do not exist in
          table 'stereotype_users') are returned. Result is ordered
          by stereotype name. If the final list is empty, a result
          without any row elements is returned in the XML answer.
example : ster?clnt=name|pass&com=lststr&str=*
          ster?clnt=name|pass&com=lststr&str=professionals&mod=*
          ster?clnt=name|pass&com=lststr&str=*&mod=p
          ster?clnt=name|pass&com=lststr&str=visitor&mod=u
returns : 200 OK, 401 (fail, request error), 501 (fail, server error)
200 OK  : in this case the response body is as follows
          <?xml version="1.0"?>
          <?xml-stylesheet type="text/xsl" href="/resp_xsl/stereotypes.xsl"?>
          <result>
              <row><str>stereotype</str></row>
              ...
          </result>
comments: the reference to the xsl file allows to view results
          in a web browser. In case the response body is handled
          directly by an application and not by a browser, this
          reference to xsl can be ignored.