checkpoint with new pyspark bitmask lite functions and a spark udf for bitmasks.

build.sbt

src/main/python/Octeres/bitmask/bitmask_lite.py

src/main/python/Octeres/bitmask/bitmask_lite_spark.py

src/main/python/Octeres/data_spark.py

src/main/scala/Octeres/DataUDF.scala

src/test/python/bitmask/test_bitmask_lite.py

src/test/python/bitmask/test_bitmask_lite_spark.py

src/test/python/test_data_spark.py

src/test/scala/Octeres/DataUDFTest.scala