rudimentary tick positions

[Shai Ayal]

attached is a patch for rudimentary tick position calculations. It is
a translation of Tom Holroyd's python code which he posted to this
list some weeks ago (Tom, I hope that by posting the code here you
agreed to it's use in octave ...).
What is missing is:
*) log axes ticks
*) minor ticks
*) does not take into account the axes size and font size to eliminate
tick overruns
*) gnuplot interaction
*) your favorite feature here

Still, I think it is good enough to serve as a basis to the above improvements.

Shai

2008-02-04  Shai Ayal  <shaiay at users.sourceforge.net>

	* graphics.h.in (axes::properties): New update methods
	for {x,y,z}lims

	* graphics.cc (axes::properties::calc_ticks): New function for
	rudimentry tick position calculation
	(axes::properties::magform): New auxilary function for calc_ticks
	(axes::update_axis_limits): call update_{x,y,z}lims if appropriate
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