19-XII-07: cgn 008b
	- now format always uses ~F instead of ~D. This corrects problems when using double precission numbers, 
	  because gnuplot doesn't understand them ( hack contributed by Zach).
	- with-gnuplot now doesn't need to type 'finish when tired to see the screen ( hack contributed by Zach).
	- start-gnuplot now has 2 keyword arguments: :persistent and :path
9-II-07: cgn 008
	- Added plot-scatter
	- Added create-scatter-data-serie
	- Added create-scatter-graphic-description
	- Added new structures : data-serie and scatter-graphic, to save
	 information about scatter graphics.
	- Added show-release-info.
	- Added two new flags: *release* and *release-date*.
	- format-gnuplot now does debug if debugging is enabled.
	- Added enable-debug and disable-debug.
	- Added *debug*, a flag to control if cgn must do debug.
	- All the library has been updated to use the new format-gnuplot facilities.
	- Format-gnuplot now understands all the options that format can understand.
	- Replot-function now can replot every type of functions.
	- Created a new manual for Cgn.
	- Animate-function now can create animations for whatever type of
	 function, only for one paramether.
	- Added animate-function, to create animations. At the moment, only
	 for f(x), and one paramether.
	- plot-function now plots using the parametric form.
20-VI-06: cgn 007 
	- Added print-graphic, to print directly from cgn.
	- Modified plot-function. Now can be used to plot g(x,y), not
	only f(x).
	- Added save-cgn, to save.
	- Added load-cgn, to load.
	- Added with-gnuplot, a macro which should be the prefered way
	to use cgn. 
	- Added the *os* special variable, to use with with-gnuplot to let cgn
	  know which os is running. This is used to print, at the moment.
	- Updated cldoc documentation.

8-VI-06: cgn 006
	- Corrected bug. Gnuplot keeped running later of using close-gnuplot.
	- Comments now translated to English. It seems that the
	original Catalonian documentation produced slow compilations
	at non Catalonian machines.
	- Added cldoc documentation.