xmlrpc: added guardian define for http.h and fixed usability by defaulting to system malloc

- with pkg the module is barely usable due to large overhead of xml tags
xmlrpc: keep pkg for sip message related ops
mtree: rpc mtree.summary returns an array to comply with xmlrpc format
mtree: rpc mtree.summary can take as parameter the name of the tree
mtree: docs updated for mtree.summary
pkg/kamailio/deb: add Ubuntu trusty support
app_java: add libgcj14-dev support
pkg/kamailio/deb: use libgcj14-dev when available
pkg/kamailio/deb: add verbose output by QUIET variable