Version as of Nov 26 2008: C-accereated scasim, projection to lat-lon, next
step: project behind the scenes, and use angle distance in the C-part.
* cscasim now uses great circle distance instead of euclidean
* changed to visual_field to generic inverse_gnomonic
* adapted man pages accordingly
*** empty log message ***
new name (canonical dot)
Renamed inverse_gnomonic to inverse.gnomonic in order to adhere to R's
canonical ways of naming things.
* Renamed inverse_gnomonic to inverse.gnomonic in order to adhere to R's
  canonical ways of naming things.
* Separated scasi.roi out of scasim.  The signatures differ too much.
* Renamed inverse_gnomonic to inverse.gnomonic in order to adhere to R's
  canonical ways of naming things.
* Separated scasi.roi out of scasim.  The signatures differ too much.
* Updated many things.
not needed anymore
now using log fixation times
Distances now returns dissimilarity per fixation, not overall dissimilarity.
Added public function trial.infos.
Documentation for the more general successor of trial.infos: constant.vars
Superseded by constant.vars.
Minor change.
1.) Found a mistake: We need to calculate the angle between fixation targets
not the great circle distance!

2.) Dropped cscasim_roi because cscasim with modulator set to 0 does the same.
removed debug messages
Version 1.01
Beautification for version 1.0 and fixes for version 1.01: Fixed two problem in
the functions for plotting scanpaths regarding the treatment of factors:

 1.) When using factors for regions of interest (ROIs), the display dropped
 unused ROIs on the x-axis rendering a somewhat misleading picture of the
 scanpaths.

 2.) When using factors for a grouping variable (e.g. condition), it could
 happen that plot.scanpaths confused the colors when at least one level in the
 factor did not occur in a plot.
A synthetic data set of nine scanpaths that resembles the set used on the
poster for CUNY 2009.
Completion of documentation for version 1.0.