master
started autotools usage overhaul with some configure.ac revision
added usage of more autoconf macros (from the autoconf marcros archive)
more autoconf macros for linker flags
conftools: Fix regression with detection of -Wstrict-prototypes
configure.ac: Require a C++11 compiler for the optional test suite
m4: Fix check for -fvisibility=hidden for Clang
Add missing MIT headers