Correcting filename
Implementation of DB index (refactoring)

Implementation of Davies-Bouldin index in a separate function.
Colormap adjustments improved and refactored
Saving "scraps" while refactoring main code.
Refactored GTM model training into function
Refactored cluster model training into function
Bug correction and minor improvements

Make matrix triangular in last step to make it correct,  add p & q to
make algorithm complete, and change distance function and repmat to
make the code slightly faster
Function to calculate Minkowski distance.
Use custom implementation of db_index

Additionally, pass options to kmeans specifying that the initial
cluster centres should be randomised.
Davies-Bouldin index implementation
Defining next steps.

After studying a bit, defining some next steps based on meeting with
Seixas on May 21st and all reading since then.
Refactoring