Generate Shorter ChangeLog starting at 5000

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5325 43c1dc8c-776e-4df2-8ef1-6e829299be21
Added new requestHangup method inside CS_EXPERIMENTAL block for testing purposes (created by Marcello)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5326 43c1dc8c-776e-4df2-8ef1-6e829299be21