Re-use the existing memory core that handles reads/writes.
This drops support for the dumpmem command, but gdb itself has
support for dumping memory regions.
The verbose command is converted to the common --verbose flag
since only two call sites use it now.
Support for the clearstats command is dropped entirely, but no
other sim really does this, and the same thing can be done by
reloading. If it's important (clearing cycle stats) to someone,
we can add a common function for it.
This port already was storing its cpu state in the sim_cpu structure, so
converting it over was pretty easy. It is allocating memory itself still,
but we'll fix that up in the future at some point.
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
