Lem editor now perfect for CIEL scripts

[vindarel]

Landed in master today: the function lisp-compile-and-load-file (C-c C-k) now ignores the shebang line, if there is one.

That way, we can have a #!/usr/bin/env ciel shebang line, but keep developing interactively the CL way.

lem-project/lem#1366

It is what the ciel script runner does.

Next step: add the feature to Slime.