FIXED:
* tplx/sprigx would throw errors on dnsx.IsPtr, because it returns a
bool and net.IP instead of a boolen and optional error. Fixed by
adding dnsx.IsPtrChk and using that instead.
ADD:
* `iox` subpackage
FIX:
* `logging` now has a way to return logWritier directly
* added significant `io.*` interface compat to logWriter -- allowing a `logging.Logger` to essentially be used for a large amount of io interaction in other libraries.
brent saner
