#276 Altimeter changes

[Stephen Krenzel]

Allows the altimeter to go to an arbitrary height,
previous limit was 100. Also, it no longer renders the
entire altimeter from 0 to n and then scissors it down
to what it viewable ,now it only renders what is being
viewed. Also the labels for the alitmeter used to be
stored in a vector, that vector is no longer needed and
has been completely removed from source.

[Stephen Krenzel]

diff for changes

[Daniel Remenak]

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Applied to CVS, thanks!
Two notes:
1. Please follow the whitespace guidelines in DEVINFO for
readability's sake.
2. Also for the sake of readability:
if (minMark < 0) minMark = 0;
is better than
minMark = minMark <= 0 ? 0 : minMark;
and eliminates the need for the related comment.