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.

thanks to rpgoldman for detecting the typo.

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.

and the implementation-dependent external-format arguments.
Actually, only add a default encoding/external-format pair and
a hook to allow for an extension that would define more.
Based on asdf-devel@ discussion thread with Orivej Desh and Robert Goldman.

External format is specified via keyword :external-format per system
or per its component, the latter taking precedence.  The value is
passed then as :external-format to #'load and #'compile-file.

When unspecified, external-format defaults to UTF-8.

(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.