README extended and exported to ascii.
tiny fix README
old comment string in outorg-hook-function fixed.
Issues with missing or badly located #+end_src at the end of code section at
the very end of the buffer partly fixed.
HISTORY updated, two new files added - out-xxtra.el and outorg2.el - for
refactoring outorg.el into two independent files, one with outline
functionality, the other with Org-style comment editing functionality (for
buffers with outline-minor-mode or orgstruct-minor-mode active).
outxxtra.el renamed, and first skeleton finished.