#20 get rid of "xxx" ESPECIALLY in function names!

[Craig Reynolds]

Following a habit I picked up at a former job, I tend to mark code that is unfinished (or experimental or needs to be revisited) with "xxx". That some of these tags have been sitting in OpenSteer source for years is embarrassing. Worse is the fact that some of the basic API of OpenSteer has functions with "xxx" in their name (sinxxx, cosxxx, xxxsteerForSeek, etc) is unacceptable.

Thanks to kidwei for reminding me of this.