Convert DSME to use autotools

Uses autoconf, optional features now have proper configuration options. All
subdirectories now use automake.

The migration tries to keep previous make behavious unchanged. It enables
same targets and tries to keep the compiler options untouched. Thus, the
Makefile.am's are a bit complicated (as they were before, too). A clean up
work to those would probably make sense.

AUTHORS

@@ -0,0 +1 @@
+Semi Malinen <semi.malinen@nokia.com>