first implementation of unittests
testing system base classes
added tests
added Memory and Time tests
added IndexPicker tests
added IndexPicker is_slice tests
added Extractor tests
added --test/-T flag
added rubik program tests
added Work test
renamed main->program
added Usage test
restructured Usage test
completed Usage test
old usage test moved
add test filter option
added testmethod descriptor
new test filtering
added utilities with sum and mean
use of cube_sum in stats