Added WB bridge to core TB.
As of yet it is untested (no test actually uses it)
Improved cache. Most of basic functionality is in but te RTL is not final.
Missing support for some of the cache intructions.
Modified a bit the cache control interface.
Still not final by a long shot.
Integrated WB bridge in core.
Modified the address map of the core.
Implemented some of the cache instructions on CPU level.
Added a few temp hacks to the core module.
Obj code package now has cputest code.
Adapted core TB to latest changes.
Added new test (cputest) meant to be self-checking.
Still a bare skeleton.