Description of problem:
When multiple files contain declaration/import/global they are not properly merged and only one package's header is used.

Version-Release number of selected component (if applicable):
BRMS-5.2.0.CR1

How reproducible:
Every time

Steps to Reproduce:
1. Open attached project
2. Run main method
3. Check test-resources/repository.xml
  
Actual results:
          <sv:property sv:name="drools:content" sv:type="String"><sv:value><![CDATA[package org.jboss.qa.guvnor

declare Dog
	name : String
end




declare Dog
	name : String
end

]]></sv:value></sv:property>

Expected results:
          <sv:property sv:name="drools:content" sv:type="String"><sv:value><![CDATA[package org.jboss.qa.guvnor

import java.util.List

global String logPrefix

declare Dog
	name : String
end

]]></sv:value></sv:property>


Additional info:
Also please note that Dog declared fact is mentioned twice!