new upload

[Hans Hagen <j.hagen@xs4all.nl>]

Hi,

I uploaded a new version of lmtx. Apart from some small fixes, the 
configuration file is hopefully okay too. I'm sure MF will check it.

However, the biggest change is hidden. In traditional tex, inserts (used 
for footnotes) are implemented using a quadruple of registers. In 
context these come from the range 132-254 which is not used by normal 
allocations. The number is basically a sort of index.

However, this box/dimen/count/skip memory model doesn't work well for 
(possible) extensions nor does the wrapped final (per page) box fit into 
the more extended regular box model (not that anyone will notice or 
abuse that, it's just that some features of boxes don't make sense in 
the perspective of inserts).

Inserts are somewhat complex (and interwoven) and are also somewhat 
fuzzy when one wants to do checking when making progress on a page.  We 
already deal with that in context in a reasonable way but I get the 
feeling that we can do better. This and the above are reasons to come up 
with a variant memory model that permits playing with additional 
features more easily. The existing storage model is stil there (after 
all it's tex) but for those willing to check the alternative, in 
page-ins.mkxl one can uncomment

    % \insertmode\plustwo

and remake the format. I rejected a mixed mode model because it makes 
the code ugly. Related mem grows on demand as with other mechanisms so 
there is no extra overhead involved.

As a consequence I had to abstract some of the insert interface in 
context a bit more (because we use accessors instead of boxes) and 
hopefully I didn't forget one. We'll see. Once I'm confident with the 
new approach we'll switch to that (low level) interface model and can 
progress. Because users don't use inserts directly themselves not much 
harm can be done.

Hans

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                                           Hans Hagen | PRAGMA ADE
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