Local environment has console logging deactivated by default.
LocalEnvironment used the number of processor cores as the default DOP.
Change MutableObjectIterator to allow immutable objects

This makes it possible to remove the Reference<T> hack.
Remove Reference<T> hack (plus some other clean-up)

Also remove Serializer<T> and only use TypeSerializer<T> which is now
Serializable.
Reset AsciiUtils to original behavior (do not implement MutableOjectIterator any more)
Minor cleanups.
Renamed AsciiUtils to SimpleStringUtils, because they actually work on more than ascii strings (all strings without surrogate chars)
Removed array datamodel and Scala Grabbag
Small step towards semi join. Added semi join functions.
TODO: Special exec strategy (runtime + optimizer) based on hash join required.
      Either no duplicates of filtering side in HT or filtered tuples removed from HT after first match.
Updated TypeExtractor and TupleTpyeInfo to work on subclasses of Tuple1, Tuple2, ...
Merge Fix
includeFields support for new Java API's CsvReader
Removed ReferenceWrappingReducer. Cleaned imports in PlanOperators. Fixes in ReduceFunction.
Added static method for DecimalTextIntParser
Changed casting
Typo
Merge branch 'staging'