-remndt
template: pers?clnt=<name|pass>&com=remndt&whr=<where_pattern>
          Order of query params is not important.
pattern : * | <SQL part following WHERE>. The '*' means all.
          A special syntax must be used: ':' for = and '|' for <space>.
          This is because spaces and '=' are replaced in WWW requests.
          Note that string values must be enclosed in single quotes.
descript: removes all numeric data records specified by 'whr' query
          parameter from table 'num_data'. If no matching records are
          found no records will be deleted (200 OK will still be
          returned). If the error code 401 is returned then no record
          has been deleted.
example : pers?clnt=name|pass&com=remndt&whr=nd_user:'kostas'
          pers?clnt=name|pass&com=remndt&whr=nd_feature|like|'laptop.%'
          pers?clnt=name|pass&com=remndt&whr=nd_timestamp>1005854664588
          pers?clnt=name|pass&com=remndt&whr=*   (deletes everything in table)
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/rows.xsl"?>
          <result>
          <row><num_of_rows>number of relevant rows</num_of_rows></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.
          Note that if a user is to be removed from the personal mode,
          the requests 'remddt' and 'remndt' should be called to remove
          decay data and numeric data respectively, together with the
          request 'remusr' to remove user features.