merge many commits and several changes to design

[Luis-Henriquez-Perez]

STILL A WORK IN PROGRESS

I changed the internal design in several ways. Most notably, I am changing what the ob-extended-tangle does. I don't think we should/need to create another header argument. Instead, I'm merely hijacking the tangle argument and allowing us to reroute its inteded location to somewhere else. I still need to work out what happens in the case of tangle yes.

[Luis-Henriquez-Perez]

First, I got tangld-build to work! 😄 finally! 🎉

I changed the ob-expanded-tangle.el (actually I may end up removing this file).

Instead of adding a new :relative-dir header argument, I rerouted the existing :tangle header arguments to the correct path. I like this approach better because it works with an existing argument instead of adding a new one.

My approach assumes that the user will write these :tangle arguments relative to the tangld system dir. So with direct building the path ~/.config/emacs/init.el would be rerouted to ~/.tangld/src/build/.config/emacs/init.el (assuming of course ~/ is the system dir).

important caveat

As I was testing this I noticed that org-babel-tangle relies on some external state. If you use file header args like the ones below and you modify them you must restart org mode.

#+TITLE: config.org
#+AUTHOR: Luis-Henriquez-Perez
#+PROPERTY: header-args :tangle ~/.config/emacs/init.el
#+TAGS: emacs config

[aldrichtr]

I've just started to go through the changes.... there are quite a lot! I'll get back to you very soon.