Add smart bcompare wrapper

In case of 2 parameters, the wrapper will short-circuit if the files are
same.

dotfiles/bash/main.bashrc

@@ -21,6 +21,11 @@ clsz() {
     tput clear; tput cup $(tput lines) 0
 }
 
+bcdiff() {
+    test $# -eq 2 && diff "$@" >/dev/null && return
+    bcompare "$@" &
+}
+
 ### .... ###
 ### BASH ###
 ### '''' ###