Switch to use tangle/file everywhere. Lots of cleanup.

Also define option predicates via the makefile option of:

make option NAME=whatever

Which defines the options in options/whatever.el and
options/no-whatever.el

Switch from using osx-p to macos-p now for osx.

There were a few other changes that snuck in that I was too
lazy to split apart. But all this should make this all simpler.

It also means you can edit source blocks in emacs sanely.

First real bug in it for years, its served me well.

Mostly bugfixes

Had a few issues with non existing source files and output.

Disable cscope/pylint from building.

Allows for local customization outside of customize

meta...

- Added default shell to be zsh -l for login
- Made xclip stuff not show up on osx tmux.conf

Just highlighted TODO messages so no huge loss. Figure out
what sucks about it later.

rtags is not working on osx, and idris is failing to compile.

Ain't got time to fix/debug right now. Later.

Adding git with all tools, mercurial with all tools, svn client
and finally bazaar for the off chance I need it.

Also add mutt and duply as they're damn useful generally. Duply
moreso because of backing up.

I'll run with my custom branch for audiofile so youtube-dl can
come along too.