Remove unused function array2str

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4537 43c1dc8c-776e-4df2-8ef1-6e829299be21
Sorted header by type of function. Removed local implementation of sccp_channel_retain/sccp_channel_release

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4538 43c1dc8c-776e-4df2-8ef1-6e829299be21