Revert parts of "* swank-loader.lisp: ASDF free again. And proud of it!"
Revert "* swank-backend.lisp (label-value-line): Remove display-nil-value."

This reverts commit fc4e2e19612e7e63237554b59d30bf3903d05184.
Smarter sldb fame details when there's nothing to display
Fix: source-path-parser honours the readtables specified in swank:*readtable-alist*
Added default values for the sldb faces
Make the key bindings for slime-quit-connection-at-point and slime-restart-connection-at-point safer. Map disconnect to 'k'.
Line up frame locals in the same column in sldb.
Fix: presentations are properly recognized at the very beginning of a buffer.
Try not to (goto-char (point-max)) when copying presentations to the repl for more flexible editing.

Doesn't work when copying from sldb, because slime-repl-send-string does the same.
Fix: slime-repl-delete-from-input-history saved back the old history entries before the in-memory ones.
Fix: inspector uses the same thread and package that was used to invoke it (e.g. for svuc customizations depending on a transaction).
Smarter slime-read-from-minibuffer: supports history and keymap.
Pad restart descriptions to start at the same column in sldb.
Order restarts in sldb so that restarts earlier on the binding stack have smaller (therefore more stable) numbered key bindings assigned to them.
Display the current package at various minibuffer prompts.
Fix: don't just define, actually use slime-inspector-insert-ispec-function.
Lower the score of fuzzy matches towards the end except for exact matches at the very end.
Always jump to the prompt when navigating the repl history.
SLDB is smarter in pruning swank frames.
Make slime-editing-map key bindings available when Slime is reading from the minibuffer.