Revert "upgrade asdf to 2.29, per request by Faré (sbcl-devel 2013-02-16)"

This reverts commit 5bf941f419b6cd275feb3ee44ca264596fbd9e8e.
1.1.5: will be tagged as "sbcl-1.1.5"
Silence a warning from the test harness for unthreaded builds.

"The variable THREADS is defined but never used.", so, in WITH-TEST only
bind THREADS under #+SB-THREAD as all places where this variable is used
are guarded by this feature expression, too.
Improve the failure output of the test :range-reduction :x87.

Namely, output the function, argument, expected and actual result.
Prevent a make-array transform from modifying source forms.

That causes repeated compilations of inlined functions to accumulate
changes made by the transform.

Thanks to Bart Botta.
(regression since 1.0.42.11-bis)
Fix a test-case in threads.impure.lisp on -sb-thread.

A test was using make-thread without ensuring that sb-thread is enabled.

Fixes lp#1141795
New keyword argument for SB-C:DEFKNOWN: :overwrite-fndb-silently

 While not useful in the compiler itself, some libraries (not only
 contribs) define their own VOPs, transforms, etc., and the error
 when clobbering pre-existing defknowns made these libraries hard
 to reload.

 Use with :allow-other-keys for backward compatibility.
clear-output: call stream-clear-output on gray streams.

clear-output should call sb-gray:stream-clear-output instead of
sb-gray:stream-force-output.

Fixes lp#1153257.
format: Signal an error for ~<~@>

CLHS doesn't allow @ to appear in the closing directive of ~<~>.

Patch by Jan Moringen.
Fixes lp#1153148
Slightly better arglist for defmethod.

(defmethod name &rest args) instead of just (defmethod &rest args).
Better errors for package operations.

Add some missing errors, make other errors to be of type
sb-kernel:simple-package-error.

Fixes lp#1154776.

DELETE-PACKAGE should be signalling a continuable error, but wasn't
since 1.0.37.44.
Accessing &MORE arguments checks bounds.

(funcall (lambda (&rest args) (car args))) => garbage,
because &more accessing didn't check bounds.

Fixes lp#1154946.
Optimize CAD*R for &MORE args.

Call %rest-ref when possible, and SECOND-FOURTH are optimized by
extension too.
Reduce consing for find-package.

Don't use return-from inside restart-case, it causes consing even when
the branch with restart-case is not taken.
Optimize pprinting of heavily nested lists.

Declare types of PREFIX and SUFFIX slots of PRETTY-STREAM to be
(simple-array character (*)), not just simple-string.
make-array transform error on unknown element-type.

Check for the type to be known, otherwise give up transforming.
Based on a patch by James Kalenius.
Fixes lp#1156095.
faster SVREF and (SETF SVREF) compilation
micro-optimize sane-package a tiny bit more
Fix SEQUENCE:SEARCH, test seq. functions with user-defined sequences

Extending the tests in tests/seq.impure.lisp to user-defined sequences
revealed that the previous implementation produced incorrect results
for some inputs.

SEQUENCE:WITH-SEQUENCE-ITERATOR now accepts NIL in the list of
variables and generates ignored bindings for these elements.

The new implementation is also slightly faster (at least for the
inputs in tests/seq.impure.lisp).

fixes lp#1153312
minor NEWS fixups