Fixed the interaction between autoconf and def.h

Frozen implementation of the comment-line command.
C-u <N> M-; will comment the next or previous N lines depending on whether N is positive or negative.
It recognises beginning or end of buffer conditions to stop

• Click to place cursor
• Wheel to scroll up and down
• Make comment-beginand comment-end buffer local
• No need for make-modeanymore
  CAVEAT: Mouse behaviour cannot be modified by user in ~/.mg3
  TODO: Handle horizontally scrolled lines

Add comment-line function.
Define comment-begin and comment-end as buffer-local variables.
For this, allow buffer-local variables to be strings or integers.

Include the bl example directory in the autoconfig infrastructure
as part of the documentation installed in the Debian package.

Add minimal make-mode, don't compile it by default. Just for testing comment-line

Update documentation of the package.

MIgrate build infrastructure to autotools

This version integrates all changes that were needed in the macOS rudix port

This version includes the rudix.org Port files. It also adds the '-v' command flag to just print out the version to the command line

Since the first tag in this github is mostly the original code in Bengt Larsson's last release, I have preserved the code and I don't need to keep the patches eternally. Thus I will use the patch system for development and integrate the patches in the releases.