Added a from-expression constructor
Refactor of Power(Ui, Ui) to return an expression
Factorial.  Added a Value property getter to make compound operators possible.
Primorial
Binomial
Fibonacci and Lucas.  MPIR 2.7.0 Section 5 (Integers) completed.
Refactored all Mpir***Expression classes to Integer***Expression
Stubbed out a HugeRational class.  Broken build: interfaces not yet implemented.
Minimum compileable rational implementation
Major refactoring in preparation for adding the rational class.  Broken build due to partial commit.
More refactoring of various macros.  Fleshed out most of the operation set for rationals, some UI/SI members commented to let the project build.
Added UI/SI/double comparisons
Added UI/SI +, -, *, / operators
Added draft tests for rational.  Global replace from int only.  Need review for completeness, many tests failing.
Refactor to make int constructors auto-allocating, and make Allocate a factory method.
Refactor rational constructors and factory methods; all constructors auto-allocate, Allocate is a factory method.  Updated rational construction tests.
Refactored unit test method names to be prefixed with the type
Fixed int expressions test
Updated existing rational arithmetic tests
Updated existing assignment tests