Roadmap for blocks and closures.
Blocks : Inheritance of package options, needed for less verbose implementation of operator overloading.
Closures : More efficient implementation (C++).
Closures : Inheritance of activation options.
Merge branch 'master'
Update README.md with an example of pipeline
Filtering with ~map ~mapR is now supported for collections
Merge branch 'master'
Notes about lock-free programming
Notes about Moar VM (NQP, Rakudo)
Method search order, settings inheritance, operators overloading :
Allow to modify the method search order from anywhere.
A new optional parameter isBlock can be passed when creating a method or routine.
The option OPERATOR_OVERRIDING_BY_ROUTINE has been abandonned.
Add more overloading of operators for array.
Merge branch 'block_closure'
Merge branch 'origin/block_closure'
Optimization of array initializer when assigning a single value
GC, Stack overflow.
GC : no longer protect myActivity in RexxMessage::send
GC : notes about debugging.
Stack overflow : add printf in RexxActivity::checkStackSpace
Stack overflow : update notes.
Merge branch 'master'

Conflicts:
	sandbox/jlf/_diary.txt
	sandbox/jlf/internals/notes/operators.txt
	sandbox/jlf/trunk/interpreter/expression/ExpressionOperator.cpp
	sandbox/jlf/trunk/interpreter/expression/ExpressionOperator.hpp