major refactoring

* move all scripts not intended to be called directly to helpers/ dir
* introduce sequencer.py as replacement for various scripts
* introduce --save option to generate.py
* other smaller changes/bugfixes

helpers/list_termine.sh

@@ -0,0 +1,4 @@
+#!/bin/sh -e
+
+khal list --day-format "" --format "* {start} {title}" -a calendars_fsmi today 30d | grep -v Fachschaftsrat | grep -v Feriensprechstunde || true
+