A patch from Chatree Srichart for "BIRT Web Viewer Integration" https://issues.apache.org/jira/browse/OFBIZ-4952

Chatree Srichart:
I have created a patch to solve a viewer servlet problem and uncomment the viewer servlet in the birt webapp. To do this will allow a user to use BIRT Web Viewer to render a report by coping a webcontent directory from birt-runtime-x_x_x/WebViewerExample directory and paste into the birt webapp directory ($OFBIZ_HOME/specialpurpose/example/webapp/birt).

These are URLs to render example reports using BIRT Web Viewer.
http://localhost:8080/birt/frameset?__report=component://example/webapp/birt/report/example.rptdesign
http://localhost:8080/birt/frameset?__report=component://example/webapp/birt/report/chart.rptdesign

jleroux: a more detailled documentation is available at https://cwiki.apache.org/confluence/display/OFBIZ/Using+BIRT+with+OFBiz

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1579356 13f79535-47bb-0310-9956-ffa450edef68