Removed ugly hold/resume from gpickup (Issue: #10)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4190 43c1dc8c-776e-4df2-8ef1-6e829299be21
cleanup transferChannels.transfer* during the hangup process, add some remarks

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4191 43c1dc8c-776e-4df2-8ef1-6e829299be21