map documentation refinement
Add minor detail to recently added map description in doc/window.txt: origin is in upper left and positive y goes downward, so not typical Cartesian x,y coordinate plane.
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@@ -58,8 +58,9 @@ files are all formatted accordingly.
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NHW_MAP is a persistent window which uses tty-style character cell
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column and row as x,y coordinates (even for tiled map). The y or row
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coordinate runs from 0 through ROWNO-1 inclusive. The x or column
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coordinate runs from _1_ through COLNO-1; column 0 is used by the core
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coordinate runs from 0 through ROWNO-1 inclusive, with 0 at the top
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and +(ROWNO-1) at the bottom. The x or column coordinate runs from
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_1_ through COLNO-1, left to right. Column 0 is used by the core
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for internal bookkeeping and not drawn on the screen. Most levels
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leave some rows and/or columns unused but the core still passes data
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(typically 'unexplored' or 'solid stone') for them and those should
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