[GRASS-dev] nviz save state

It looks like the Save state functionality for nviz broke when the
interface to nviz was updated. I am hoping that it requires just a small
fix - Michael can you please check your changes to see what might have
broken it?

When saving state it complains as follows (I am not concerned about
these because none of what it complains about needs to be saved)

Diagnostic: invalid command name "Nviz_sdiff_save" -- Save procedure
for panel sdiff may not be defined
Diagnostic: invalid command name "Nviz_query_save" -- Save procedure
for panel query may not be defined
Diagnostic: invalid command name "Nviz_pick_save" -- Save procedure for
panel pick may not be defined
Diagnostic: invalid command name "Nviz_animation_save" -- Save
procedure for panel animation may not be defined
Diagnostic: invalid command name "Nviz_kanimator_save" -- Save
procedure for panel kanimator may not be defined

But the problem is when loading the saved state :

[...]
Diagnostic: wrong # args: should be "set varName ?newValue?" -- Load
procedure for panel main may not be defined
Diagnostic: invalid command name "Nviz_720 752_load" -- Load procedure
for panel 720 752 may not be defined
Diagnostic: invalid command name "Nviz_22.0_load" -- Load procedure for
panel 22.0 may not be defined
Diagnostic: invalid command name "Nviz_4.462_load" -- Load procedure
for panel 4.462 may not be defined
Diagnostic: invalid command name "Nviz_379.50_load" -- Load procedure
for panel 379.50 may not be defined
Diagnostic: invalid command name "Nviz_0.504 0.984_load" -- Load
procedure for panel 0.504 0.984 may not be defined
Diagnostic: invalid command name "Nviz_1_load" -- Load procedure for
panel 1 may not be defined
Diagnostic: invalid command name "Nviz_234.500000 234.500000
120.363991_load" -- Load procedure for panel 234.500000 234.500000
120.363991 may not be defined