-getusrs
template: pers?com=getusrs&whr=<cond>
          <num_pattern>&srt=<order_pattern>&cmp=<comp_pattern>
          Order of query params is not important.
pattern : * The '*' means all character sequences.                 
descript: Returns all the users that has a name that satisfies the whr pattern
example : pers?com=getusrs&whr=*
          pers?com=getusrs&whr=sample*
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/user_profile.xsl"?>
          <result>
              <row><usr>user</usr></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.