[dev-context] enco-uc fixes

[Adam Lindsay]

Hey all.

A couple enco-uc fixes to be confirmed:
\definecharacter threequarter    {\uchar0{190}} % was threequarters, oops
\definecharacter ordmasculine    {\uchar0{186}} % wasn't defined
\definecharacter ordfeminine     {\uchar0{170}} % wasn't defined
\definecharacter percent         {\uchar0{37}}  % wasn't defined
\definecharacter textunderscore  {\uchar0{95}}  % wasn't defined

%D Not sure, because it can be a chore to create yet another font:

%\definecharacter trademark       {\uchar{33}{34}} % wasn't defined

%D This isn't defined in many fonts, but it should be consistent:
\definecharacter textminus       {\uchar{32}{18}}

In other news, would a TeX'n'Unicode encoding interest anyone?

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 Adam T. Lindsay, Computing Dept.     atl at comp.lancs.ac.uk
 Lancaster University, InfoLab21        +44(0)1524/510.514
 Lancaster, LA1 4WA, UK             Fax:+44(0)1524/510.492
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