org-9 and higher compatible branch

The rl-no-parser branch is renamed to org-9-plus.
org version 9.0 or higher is required.

This branch substantially refactors the code base from the old master branch and adds new features.

original concept in its last version

The original conception of ravel is embodied in this release.

Other branches were refactored in a largely incompatible manner and new development will be focussed on them.

This branch remains for users who haven't upgraded to another branch and in case any users need bug fixes.

org-8

org-8 is the ravel-lang branch renamed.

It will work with org-8. It will not work with org-9.

This branch substantially refactors the code base from the old master branch and adds new features.