description:
  birt-runtime can't export report to doc/pdf/ps/ppt,only export to xls.

test build:
birt2.6.0 v20100430-1143

step to reproduce:

1. deploy runtime on tomcat 6.0.16
2. view example report
3. select "export report"

expect result:
export format can choose doc/xls/ppt/pdf/ps

actual result:
export format can only choose xls,can't choose doc/ppt/pdf/ps
the export dialog contains only the xls format, all other format are missing.

added com.lowagie.text to web-inf/plugins directory for runtime package.
verified in daily build v20100504-0630