[Bug-gnubg] temperature map updated

[Joern Thyssen]

Hi,

I've updated the temperature map a bit:

(1) fixed some bugs reported by Michael Depreli
(2) the "squares" are now forced to be square (suggested by Sho Sengoku)
(3) the squares are now smaller. One temperature map is now 400x500
    pixels on my box (it may vary with font size, window decoration,
    etc.) This means that there is less room for the equities and moves,
    so you'll have to manually enlarge the window. 
    (suggested by several people)
(4) you can now see more than one temperature map by selecting multiple
    moves in the hint-dialog. These are shown the same dialog and uses
    the same temperature-scale, which should make it easier to compare
    one or more moves. Temperature maps for two moves is 650x500 pixels,
    four moves is 650x765, and nine moves is 936x1059 on my box.
    (suggested by Sho Sengoku)
(5) the equities are shown correctly when showing the temperature map
    after a given move, i.e., the equity is inverted
    (suggested by myself)


Possibly improvements:

(a) save window geometry
(b) add Eval-button for special settings (e.g., cubeless)
    (and add button for eval settings)
(c) show Difference Histogram as well (possibly in a notebook or
    similar)
(d) export temperature map to html

I've added the above to the TODO file.

I'm going to be rather busy next week, so you'll probably not see any
updated in a while.

Jørn