Fix sign related issues.
authorbatt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Mon, 7 Jun 2010 17:44:45 +0000 (17:44 +0000)
committerbatt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Mon, 7 Jun 2010 17:44:45 +0000 (17:44 +0000)
Altitude and decimal degrees positions can be negative!
Without this patch, dangerous overflows can happen.
Also fix some minor documentation issues.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@3896 38d2e660-2303-0410-9eaa-f027e97ec537


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