*  direct references of reset are discouraged
*  replaced all direct refs with RegInits, where appropriate
*  fixed overwrite bug in test outputs, each test writes in separate dir

* repeat now also works with size which are not a power of 2
* more complex Mux logic is only generated in case size is not a power
  of 2, otherwise identical as before
* cleaned up a little and used new logging facilities to implement
  fine-grained info at each consumption

* implemented both hardware (runtime) logging and constructor logging
  (compile time)
* mix-in trait Logging provides methods info, warn and error (and cinfo,
  cwarn, cerror resp. for constructor logging)
* logging level is controlled by implicit Logging.Level, determined at
  each call, allows for selective logging

* chisel3 is a little finicky with peek/poke: it seems only stuff in the
  io bundle of modules is really safe
* needed to replace peeking in the internal mems, since that seems
  to crash the LoFirrtlEvaluator
* all tests functional again

* minor bug: valid would be asserted during reset, fixed

* testing utility: provides fixed data via Decoupled
* configurable with/without wrap-around
* unit tests