[Tagging] RFD pipeline sub tag substance

[althio]

> Sorry, I was thinking of gas as a product (as in natural gas), not a
state of matter.

Confusing, so I proposed natural_gas for natural gas.

> I was thinking of substance=* as a category (water, fuel, oil, gas,
coolant, etc etc

I think we need (as often as possible) to tag separately nature and
purpose, otherwise it gets messy.

* nature, matter, substance, with eg. substance:name = *
* use, usage, purpose... with eg. pipeline:usage = drinking_water,
wastewater/sewage, drain/irrigation, transport/transmission, heating,
coolant, industrial, communication...

The categories with only one key are not well cut. Water can be coolant,
oil can be fuel, ...
We should not mix nature and purpose. And it should be clear in the keys.
The mapper could fill what he knows (nature and/or purpose) and leave what
is unknown.

> substance:state=* one of the 3 states, along with multi and slurry. Solid
is assumed to be pneumatic then?

I would prefer another term than solid.
state=solid is apparently a match for cables...
so it implies static=yes ;) ;)
maybe "powder" or something like "particles_in_gas"
if substance:moving=yes ;) ;) ;)
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