doc fixes.  re-order some xsubs to have better doc ordering.  hide pixels_per_unit from docs; prefer get_pixels_per unit since there's a set_pixels_per_unit.  adjust ALIASed xsubs to avoid having an extra unused name in the symbol table.
doc fixes.  re-order some xsubs to have better doc ordering.  hide
pixels_per_unit from docs; prefer get_pixels_per unit since there's a
set_pixels_per_unit.  adjust ALIASed xsubs to avoid having an extra unused
name in the symbol table.

svn path=/trunk/; revision=86

GNOME/perl-Gnome2-Canvas,GNOME/perl-Gnome2-Canvas