Remove XEmacs compatibility layer

Also use declare specs instead of top-level `put'

* slime-tests.el: Don't use xemacs compatibility layer.

* slime.el: Removed xemacs compatibility layer. Use indent specs.
Don't set `compile-command' file-local var.

* contrib/slime-autodoc.el (slime-autodoc-maybe-enable): move to appease
byte-compiler.

* contrib/slime-fuzzy.el (slime-fuzzy-choices-buffer): use just `add-hook'.

* contrib/slime-fuzzy.el (slime-fuzzy-choices-buffer): use just `add-hook'.

* contrib/slime-presentations.el (slime-presentations): use just `add-hook'.

* contrib/slime-repl.el: Don't use xemacs compatibility layer. Update
indentation.