usability : reorder node 'cycle' when ctrl+click

[v1nce]

I see two problems with ctrl+clicking a node

when I ctrl+click a smooth node I get an
autosmooth one (*) then
a symmetric (*) then
a cusp node (*) then
a smooth node (*) again

problems:

1) the cycling order is inconsistent with order of icons in "nodes bar"
cusp, smooth, symmetric, auto

2) loss of information
all steps marked with * are lossy (= the curve changed) and yes they are all lossy : )

proposal :
1) reorder nodes icons and
2) use the following order

symmetric => smooth (no loss)
smooth => cusp (no loss)
cusp => auto (lossy)
auto => symmetric (lossy but only a bit as it oftens turns into a smooth one)

see : http://www.inkscapeforum.com/viewtopic.php?f=5&t=12234

[su_v (suv-lp)]

The order of the node types (Ctrl+click) is already being discussed in
- Bug #217029 “Node type order should change when double clicking”
  <https://bugs.launchpad.net/inkscape/+bug/217029>