Bug fix #33748

Old fixes, since 2009 and before! Related to Curve object editmode:

- normals are not being drawn for hidden curves anymore
- even worse: Blender also didn't hide the extrusions or bevels for hidden curves
- outside edit mode, it shows all (as for all other modes)
- (de)select-all now works when 1st (or any) handle was hidden.




git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53818 954f8c5b-7b00-dc11-b283-0030488c597c