Move most Makefile stuff to CL in bin/asdf-builder!
Moving the build & test code from Makefile + shell to Lisp:
fixing bugs, moving asdf-builder into tools and splitting it into
minimal script itself and Lisp source.
Add a description of the source tree in the README.
Rename install-asdf-as-module to install-asdf.lisp;
update it and its documentation.
Add help, flesh out release function.
Update docstrings for better make help
Better document parameter passing between make and asdf-tools
Count (values) as returning code 0 (success) for main.
Fix positional parameter call to test-scripts.
Tweak manual, test-basic.
Declare all public commands as Makefile targets for shell completion. Tweaks.
Add docstrings for the latest two commands.
Have asdf-tools load quicklisp when available.
In this case, load quicklisp after asdf, not before.
Document the Quicklisp situation.
Make asdf-tools work well with quicklisp.
Fix parenthesizing so ASDF is always being configured properly (Oops).
Merge branch 'master' into minimakefile

Conflicts:
	Makefile
	bin/asdf-builder
Fix make-git-tarball. Unsuccessfully try to hush quickload.
Hush ql:quickload, as per recommendation by Xach, using make-broadcast-stream.
Fix missing comma in extract-tagged-asdf.
Test upgrades against 3.1.3.
Better tarball making: tell MacOS's BSD tar to not include resource files
and don't create a subdirectory or symlink with .asd files even temporarily,
for it can create conflicts if interrupted or in a race condition.