[Tagging] Feature Proposal - Voting - (Substation Refinement)

[Ole Nielsen]

The Substation Refinement proposal has now been stable for some time. It 
is therefore time to announce the voting on this proposal.

http://wiki.openstreetmap.org/wiki/Proposed_features/Substation_refinement

In short it
- introduces a consistent tagging scheme for substation properties and 
substation components.
- deprecates the confusing power=station tag
- corrects the spelling of power=sub_station to power=substation

Ole / polderrunner