Remove obsolete subtractions and style files from examples

examples/fully_coherent_search_using_MCMC.py

examples/grid_examples/grid_F0F1F2.py

examples/grid_examples/grided_frequency_search.py

examples/other_examples/twoF_cumulative.py

examples/semi_coherent_directed_follow_up.py

examples/semi_coherent_search_using_MCMC.py

examples/using_initialisation.py