Autotools updates

Few autotools updates and de-duplication of the README file.
NOTE: not sure about the readme file if that works on windows this way.

Please remember to run "make distcheck" call to test and then release the source tarballs from the tag :)
Given the fact nobody actually uses the docbook2man name it is kinda moot. And having to wait on bazilion distros to rename the thing we still have to keep the compat to have our package work properly on the older releases.