Analysis views: data filtering

[weiju]

Analysis views are implemented wrong:

1. it uses client-side filtering. Since data is filtered based on system status, this can and should be done
   by the database
2. The views.py is incorrectly implemented as well: There is plenty of hardcoded stuff going on there

This results in incomplete chart rendering and is most apparent in the splitting not working after eliminating some of the redundant Javascript code.
The solution is to use proper filtering code which should further reduce the amount of code.