-remftr
template: ster?clnt=<name|pass>&com=remftr&str=<str_pattern>[&ftr=<ftr_pattern>&ftr=...]
          Order of query params is not important.
pattern : ftr_pattern and str_pattern can be * or name, where name can be a path
	  expression (group1.*)
descript: Removes all features matching the ftr_patterns specified from all stereotypes
	  matching the stereotype pattern specified. If no features patterns are
	  specified * is assumed and all faetures are removed from all stereotypes
	  matching str_pattern;
example : ster?clnt=name|pass&com=remftr&str=test.*&ftr=testFtr.sub1.*&ftr=testFeature1
returns : 200 OK, 401 (fail, request error), 501 (fail, server error)
200 OK  : example result body:
	  <result>
	    <row>
	      <num_of_rows>1</num_of_rows>
	    </row>
	  </result>