Revert "Error handling."

This reverts commit fd043c0fc47ab28e573e71f4a48bdf4dea8b274d.

Conflicts:
	README.md
Revert "Delete iolib/socket."

This reverts commit 99eab4a4ddb9c4f7d4de5427d98f41605d5f3156.

Conflicts:
	src/llsocket/grovel.lisp
	src/llsocket/package.lisp