Tidied up the format control strings for errors.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
Notes (comments and docstrings) from ASDF code tour.
Update changelog.
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf

Just documentation (docstring and comment) additions from Fare's
walkthrough.  These conflicted with his code improvements during the
walkthrough.

Conflicts:
	action.lisp
	lisp-action.lisp
	operation.lisp
	plan.lisp
Bump version to 3.1.0.61
Merge branch 'master' of ssh://common-lisp.net/project/asdf/public_html/asdf
Update the READMEs
Update some comments and docstrings, proofreading Robert's edits.
Remove some trailing spaces.
Bump version to 3.1.0.62