Add abyss C++ library

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2642 98333e67-4a24-44d7-a75c-e53540dd3050
Fix typo in comment

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2643 98333e67-4a24-44d7-a75c-e53540dd3050
Fix typo

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2644 98333e67-4a24-44d7-a75c-e53540dd3050
Improve error message

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2645 98333e67-4a24-44d7-a75c-e53540dd3050
Add SessionGetBody Abyss method

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2646 98333e67-4a24-44d7-a75c-e53540dd3050
Add XML-RPC request handler for C++ Abyss server, split C++ utilities into new libxmlrpc_util++

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2647 98333e67-4a24-44d7-a75c-e53540dd3050
miscellaneous update

git-svn-id: http://svn.code.sf.net/p/xmlrpc-c/code@2648 98333e67-4a24-44d7-a75c-e53540dd3050