by using unintern rather than fmakunbound for redefined generic functions.

This matters if you e.g. open asdf.lisp in LispWorks before you load it,
in which case it will automatically create an ASDF package
with a default use list that pulls in symbols from LispWorks's own defsystem.
Also, export strcat.

Add a hook to autodetect file encoding.
Don't use :unspecific on ecl, it breaks asdf-pathname-test.script
Disable warnings testing when compiling asdf with SCL. Bug in SCL?

This ensures backwards compatibility with 2.20 and earlier,
for now, until the dust settles on asdf encodings.
Update documentation about encodings.
Export more utilities. Document some of them.
Remove ununspecific. Accept :unspecific on more implementations.

Make logical pathname test work on disjoint files, for now.
Fix test-upgrade wrt recent package tweak in testing.

Avoid error from missing system's source-file when upgrading from ASDF 1.

The issue fixed is that most Lisps don't like
*default-pathname-defaults* being a logical-pathname.
Added a test for logical-pathname functionality;
it all works on CCL, and works better on other Lisps after the fix,
but there are still logical-pathname issues on SBCL, CLISP and more.
Also, a package cleanup of our test suite.

Minimal documentation.

as expanded from the read-conditionals. Use (progn :default :utf-8) instead.

that's causing a warning with SBCL.

(in the end, the issue was not in ASDF, but the refactoring remains).

When specifying a function as output-translation,
we accept either (:function symbol) or
(:function (lambda (pathname absolute-source) ...)
The second case wasn't properly handled.
Minimal testing included.
спасибо Сергей.

WEAKLY-DEPENDS-ON needed to pass the ERROR-P NIL to FIND-SYSTEM in order
to behave properly.

Added documentation for previously-undocumented weakly-depends-on.

From bug report by Rupert Swarbrick.

Thanks to Sergey Katrevich for tracking the bad parenthesization.

for smoother upgrade. Update web page.

Apparently, ecl doesn't like (change-class x 'standard-object).

to properly deal with paths gotten with GETENV.
Bug introduced with subpathname in 2.017.27. Should fix debbugs #647544:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=647544#10
Thanks to Desmong O. Chang.

and add more extensions to clean in the Makefile.

they break the r-i contract and mess up with asdf-dependency-grovel.

in view of using it in a system-granular parallelizing backend.

Don't defparameter *system-definition-search-functions*, use defvar and fixup.
Clear *systems-being-defined* when upgrading asdf,
but re-find them immediately because they may be needed
as part of a higher operation.
Thanks to Nikodemus for reporting the bug while using quicklisp.