moving most examples to code_fragments, selected ones to demos

code_fragments/dokk/KEYS

code_fragments/dokk/config.py

code_fragments/dokk/datafiles/dengue/level.ini

code_fragments/dokk/datafiles/dengue/levelF.ini

code_fragments/dokk/datafiles/dengue/ligand.sdf

code_fragments/dokk/datafiles/dengue/protein.pdb

code_fragments/dokk/datafiles/dengue/surface.face

code_fragments/dokk/datafiles/dengue/surface.vert

code_fragments/dokk/datafiles/dengue/top_ten.ini

code_fragments/dokk/datafiles/glyoxalase/level.ini

code_fragments/dokk/datafiles/glyoxalase/levelF.ini

code_fragments/dokk/datafiles/glyoxalase/ligand.sdf

code_fragments/dokk/datafiles/glyoxalase/protein.pdb

code_fragments/dokk/datafiles/glyoxalase/surface.face

code_fragments/dokk/datafiles/glyoxalase/surface.vert

code_fragments/dokk/datafiles/glyoxalase/top_ten.ini

code_fragments/dokk/datafiles/hud.ini

code_fragments/dokk/datafiles/hudF.ini

code_fragments/dokk/datafiles/retinol/level.ini

code_fragments/dokk/datafiles/retinol/levelF.ini