src/contrib/asdf/asdf.lisp::
 * Update

 src/general-info/release-20e.txt::
 * Update

o Add release-20e.txt.

o Add release-20e.txt.

general-info/release-20c.txt
o Update to asdf2 2.017.

cmucl.

  - Two minor bugs in error handling of compile-file*
  - Add optional arg to ensure-source-registry
  - Add clear-system
  - use /etc/common-lisp as documented
o Add file-comment.

among other things.

end of the source registry so that users can use other versions if so
desired.

default source registry.

asdf/asdf.lisp:
o Current version of asdf2 imported from common-lisp.net asdf
  project.

defsystem/defsystem.lisp:
o Restored from repository and updated to current version from
  clocc.sourceforge.net.

code/modules.lisp:
o Indent docstrings to match the style of cmucl docstrings used
  elsewhere.  (Lines after the first are indented 2 spaces.)
o Add module for asdf and defsystem.

tools/build-utils.sh:
o Compile asdf and defsystem so when users require them, they're not
  compiled again or run in the interpreter.

tools/clean-target.sh:
o Keep the asdf and defsystem directories when requested so that both
  x87 and sse2 versions can be built.

tools/make-extra-dist.sh:
o Skip the asdf and defsystem directories when building the extras
  tarball; we don't need copies in the main and extras tarball.

tools/make-main-dist.sh:
o Install the asdf and defsystem directories in the correct place
o Copy the asdf and defsystem fasls.