[NTG-context] new units

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

Hi,

We now officially have three new units. These were officially introducd 
at the 2023 BachoTeX meeting in a presentation where the chair of the 
four person strong team also did the final live callibration (using the 
edithorial callibration instrument made for that purpose). An upcoming 
article in TB will explain the details of the process and also a careful 
mathematical annalysis of how we reached the right value with a high 
precission. The actual implementation is the most boring part.

\starttext

\startTEXpage[offset=1ts]
     Hello World!

     \the\dimexpr 1ts

     \the\dimexpr 1es

     \the\dimexpr 1eu

     \eufactor20

     \the\dimexpr 1eu
\stopTEXpage

\stoptext

The es (Edith) unit replaces the inch, and the ts (Tove) is one tenths 
of than (just like we have cm and mm). The eu (European Unit) is an 
adaptive one that defaults to 10 ts == 1es and can be multiplied by 
setting the \eufactor (default 10) which makes it possible to define 
layouts that easilly scale to different output media (important for the 
mobile phone / table generation).

This means that MWE that use inches will likely no longer be considered 
valid and probably will be dealt with slower (or just ignored).

These units can be used in the current upload. In a next upload the "19 
feet max" message that tex issues when reaching a maximum will be 
adapted to a more realistic variant. (Actually, because tex has no foot 
unit, we could as well replace that with a more impressive little feet 
unit but we forgot to measure the smallest foot present which i guess 
was about 3 es so the limit is then some 75 bare theodores.)

Hans


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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