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/compile_presentation.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+dest_file="presentation_$(date +%Y-%m-%d).tex"
+
+echo Compiling
+mkdir -p data/presentation
+cd data/presentation/
+
+latexmk -pdf "../$dest_file"
+ln -srnf "presentation_$(date +%Y-%m-%d).pdf" ../../presentation.pdf