* remove the redundant output of of \n
* rename/re-impl `common/envSlice` and export it as `Env`
* export `Register` a wrapper around registry.Register is prep for moving the methods into their own packages
* export the byeDefer function as Defer
* export mg.msDur as mg.Since and mg.uid as mg.Uid
* move proc.go and m_cancel.go into meth/exec
* move mg/m_exec.go into meth/exec/
* keep track of the locations from which methods are registered to make deugging easier
* move mg/m_ping.go to meth/ping
* move mg/m_hello.go to meth/hello
* load the exec, hello and ping methods
* adjust the _exec_c-related code to handle the output of meth/exec
* add a constructor for ProcTable so it can be used/tested outside the package
* output the token and tag in addition to the write error when Broker.Send fails to make debugging easier
* output the method and token in addition to the error if json decoding of command args fails to aid debugging
* bundle gosubli.me/sink
* replace the _rebuild setting with _av which results in automatically changing about.VERSION to the current time
* initial re-impl if meth/exec (minus the 9o features like switch)
* add a fallback cid so commands can be cancelled even when one isn't specified
* on *nix: setsid and send the kill and interrupt signals to the whole process group instead of just to the individual process