Copyright headers corrected for all scripts (commits squashed)

Copyright headers updated in figuregen, khmer, novelty and plots

Copyright header updated under tests

Copyright headers updated in all .sh files

Updated copyright headers in all CPP and MATLAB files, added when not
found
sandbox/*.py: chmod u+x; copyright years & contact updated

a. All sandbox scripts are now executable
b. All scripts now conform to pep8
c. Copyright years changed to corresponding years in appropriate files