chore(rc,profile,aliases,completion,libs,functions): Remove shebangs from sourced files

These files are always sourced (never executed directly), so the
#!/bin/bash shebang is inert and misleading. Drop it consistently
across rc.d/*, profile.d/*, and aliases.d/*.

libs/ip.bash

@@ -1,5 +1,3 @@
-#!/bin/bash
-
 function ip_to_hex ()
 {
 	if test -e "$1" ; then echo "Usage : $0 XXX.XXX.XXX.XXX" ; return ; fi