Avoid raising error in print function on generic cdata
Add sublime files in .gitignore
Add a couple of handy scripts for linux
Improve matrix pretty printing with small integer numbers
Implement plot's multi level labels

Preliminary implementation.
Factor grid drawing function in plot class
Remove template parameter from plot class
Rename plot method name for multi labels
Add locks and update call in plot multi label function
Add function to clear plot's multi labels
Merge branch 'factor-labels' into gdt-new
Adjust multi labels plot's spacing
Fix error in multi labels mark drawing
Use multi labels in gdt plotting functions