Reanranging + Some useful shortcut

Still TODO: make sure each file is loaded only when it's supporting
prereqs exist

_home/dot_sz.shrc.d/byobu

@@ -1,5 +0,0 @@
-if [ -z $_byobu_sourced ]; then
-  _byobu_sourced=1 . /usr/bin/byobu-launch 2>/dev/null || true
-  exit
-fi
-