* Add some unit tests for provenance with node replacement

* One more test

* add provenace propagation

* Adds ability to control whether provenance is on or off

* Add some unit tests for provenance with node replacement

* One more test

* add provenace propagation

* Adds ability to control whether provenance is on or off

* Removes extraneous semicolon

* Fixes include header errors

* Reimplements provenance enable flag using global variable

* Fixes style issues.

* Adds newline at the end of file.

* Fixes function return type.

* Adds RAII mechanism for localizing provenance enable state in testing.

* Improves getter/setter method name to match variable name.

* Adds s_ prefix to global variable provenance_enabled.