Network specification confusing

[dje-dev]

Network specifications expect only the base name (ID), for example use
LC0:703810
instead of
LC0:weights_run2_703810.pb

This behavior may be convenient but could also be confusing. Consider supporting both modes, or issue a warning as needed.

(based on feed back from masterkni666)

[dje-dev]

Implemented, beginning with v0.87 the specification string can optionally omit the LC0: prefix, or be a full path/filename instead of a shortened version.