Started Worksheet 3 with quick and dirty non clean code
Merge remote-tracking branch 'origin/master' into Benni
Revert "Merge remote-tracking branch 'origin/master' into Benni"

This reverts commit c81a04dabe9dbec2f311100898175b0bae3348de, reversing
changes made to 5b7bd0b46e1c60cba452f096d86881202e3bd809.
Now with non-quick and clean code :P

Merge remote-tracking branch 'origin/master' into Benni (reverted from commit c81a04dabe9dbec2f311100898175b0bae3348de)
A bit more of refactor done and sparse matrix added
Created worksheet3 to process all three methods. Not finished yet
Restored build_weights_matrix
Some Corrections
Modified some scripts/functions
Merge remote-tracking branch 'origin/Johannes'