Operation annotations

Proxy changes: default methods, verification, exposing fieldMap, support for both FieldMap and ModifiableFieldMap
  Processing: chaining

Proxy verification
Misc idea settings

Batch ranking query

major update that adds an UpdateLog that is automatically replayed in case of a hard system fall

Proxy verification
Misc idea settings

modifying <String, ? extends Object> to <String, Object> in all maps in the FieldMap; fixing bug in ModifiableFieldMapBase

Alow construction of BatchKNNQueryOperation using any Iterator,
not only StreamGenericAbstractObjectIterator

Master

 * removing one constructor from JoinQO that had the same number of arguments as other constructor that was used more often

 * randompivotchooser marked as deprecated, because it does not select the pivots uniformly; it took me about 8 hours of my time