* whitespace cleanup
* Remove access check from COWMap.__setitem__/__getitem__
* Access checks happen via read/write, so these checks are unecessary.
* Add force parameter to read/write functions
* Introduce to AbstractCpu's accessors
* Add mem force tests
* Apply force param to symbolic operations
* Add symbolic force write tests
* Clean up test
* Fix symbolic write behavior; add tests
* initial
* Clean, only store address in message if not symbolic
If it's symbolic,it renders like
Generating testcase No. 2 - Invalid symbolic memory access (mode:r) <<manticore.core.smtlib.expression.BitVecAnd object at 0x7fd6dcd14410>>
which is not useful output to the user.
* Format as hex
* Fix tests
* Rm comments
