Integrate Macaddr module

Include Macaddr tests, ensure all exceptions are raised as Parse_errors,
fix short address bug and long address bug.
Change Ipaddr.Parse_error exn and document Ipaddr interface

Now Ipaddr.Parse_error contains both the error condition and the failing input.
DOCS
Update OASIS/findlib version
OASIS regen
Update (more) _oasis metadata
oasis regen
Added blank, broadcast and localhost IPv4 addresses.