[PROJ] Complete list of unit names?

[Even Rouault]

On lundi 8 avril 2019 08:55:06 CEST Kristian Evers wrote:
> There's also proj_list_units() [0] which returns all the units that PROJ
> has
 known about for years and years. It is not connected to the database
> in any way but I assume that there's a good correlation between units
> returned by proj_list_units() and what is used in the database. No
> guarantees though.

There's intersection, but none of them is a superset of the other one. There 
are a few PROJ hard-coded units without EPSG equivalent:

    {"dm", "0.1", "decimetre", 0},                       // no EPSG equivalent
    {"in", "0.0254", "inch", 0},                         // no EPSG equivalent
    {"us-in", "0.025400050800101", "US survey inch", 0}, // no EPSG equivalent
    {"us-yd", "0.914401828803658", "US survey yard", 0}, // no EPSG equivalent
    {"ind-ch", "20.11669506", "Indian chain", 0},        // no EPSG equivalent

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