Development headers for the Osmocom SIGTRAN library

 libosmo-sigtran is a shared library containing SS7/SIGTRAN related
 functionality, including connection-less and connection-oriented SCCP as per
 ITU-T Q.71x, M3UA (MTP3 User Adaptation) according to IETF RFC4666, SUA
 (SCCP User Adpatation) according to IETF RFC3868 as well as MTP-level routing
 function and handling of signaling links, linksets, ASPs, SGs, etc.