Blender Git Loki

Bugfix #24860

On entering editmode Curve/Nurbs, the undo buffer was not
correct; storing old Curve/Nurbs object name. This caused
for example the Operator tool redo options to fail; it added
another curve on first use (with user pref "enter editmode).

Solved with adding good undo push + nicer code for curve and
nurbs naming.