Adjusted CoGroupIterator
Adjusted test programs to generic signatures.
Fixed CoGroupSortMergeIterator
First part of SortMergeMatchIterator
Relocated some tests, working on cluster representations
Further work on representation updates
Putting some clustering operators together
Extended  KeyGroupedIteratorTest
Adopted BlockResettableIterator to paged memory model.
Minimal HashPartition tuning
Added spillable output view for record caching.
Removed old obsolete classes.
further work on clustering
Adopted spilling resettable iterators to pages memory model and I/O views.
Various minor one-line additions / cleanups.
Cleaned and consolidates I/O Manager code.
Adopted SortMerge strategy for match.
MemoryManager changes to page memory manager.
Removed old input view files.
First step to adopting runtime task classes.
Moved serializer classes to pact-common
First portion of task adoption to generic runtime.
Data Source and Sink with INput / Output Format refactoring...
initial commit