plugins: possibility to define new data type/format

[RLa <regis lachaume gmail com>]

Have a good evening,

As an astronomer, I need to enter coordinates in the classical sexagesimal
format using degrees (0 to 360 with 1/60 and 1/3600 divisions) or angle
hours (0 to 24 with 1/60 and 1/3600 divisions, that's right ascension). 
Using "time" format with "[HH]:mm:ss" is OK, until one has to use
trigonometric functions to perform spherical trigonometry... then you have
to multiply by 180/pi() or 12/pi() in each call to a trigonometric function,
and not to get confused between declination (180/pi) and right ascension
(12/pi)!

Would it be possible to define a new data type via plugins (angles using
radians internally, but displaying something else via formats, like dates
that are represented internally like an offseted Julian Day) like one
defines functions? 

Sincerly

-- 
Régis
-- 
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