numpy/pandas/plplot demos

- 21ab7c0428 added a description (comment) of what the demos do vor 2 Monaten
deps 34e20ff990 fixed peewee dependency? vor 2 Monaten
src 21ab7c0428 added a description (comment) of what the demos do vor 2 Monaten
.gitmodules 44dc4ac033 updated git modules vor 2 Monaten
CMakeLists.txt 3156674b9a attempt at interactive|updating graph - noticed strange behavior vor 3 Monaten
run.sh 6f39916b32 fixed run.sh not running demo2 vor 2 Monaten