preparing for autotools
moved files as they are to src/ to avoid confusion on successive commits
*.[ch] and ts.1 moved into src/
Makefile moved into src/Makefile.noauto
moved outdated docs and files not useful to the build into legacy/
those files will be updated according to the mainstream
but will be availables only on the repository of the fork
not in distributed packages, a note about in README.1st
add GNU/Autotools support
make check work but use testbench.sh as it is from mainstream, may need some rework