Various patches from Matt Jerdonek and Oyvind Harboe: * cdl/ppp.cdl: * src/ipcp.c: Add option to disallow negotiation of old-style VJ compression * include/ppp.h: Add structure to track ppp failure reasons * include/pppd.h: Fix compiler warning * src/auth.c: * src/lcp.c: * src/pppd.c: Add code to track ppp failure reasons * src/chat.c: Fixes to clear out buffer space to allow chat script to run multiple times. Note: function is still not thread-safe * src/sys-ecos.c: Reset carrier detected bit when carrier lost Reset ppp_tty control block when PPP started * tests/windows_telnet.c: * cdl/ppp.cdl: Added windows_telnet example application. Connects to Windows PPP server and waits for a telnet session.