Cylindrical Shell

Description
A cylindrical shell is created by the command: CSX = AddCylindricalShell(CSX, propName, prio, start, stop, rad, shell_width, varargin) with the following parameters:
 * CSX: default first argument, containing the CSXCAD data structure
 * propName: name of the (previously defined) property (e.g. a metal or material)
 * start, stop: [x y z] coordinates of the start and end points of the cylinder central axis
 * rad: radius of the cylinder
 * shell_width: width of the cylinder shell
 * varargin: a key/value list of primitives variable arguments

Note:
 * The inner radius of this shell is: rad – shell_width/2
 * The outer radius of this shell is: rad + shell_width/2

Example
CSX=AddMaterial(CSX,'plexi_shield'); CSX=SetMaterialProperty(CSX,'plexi_shield','Epsilon',2.22); start=[0 0 -40 ]; stop=[0 0 40 ]; CSX=AddCylindricalShell(CSX,'plexi_shield',5,start,stop,30,5);
 * Create a cylindrical shell with radius 30 drawing unit and shell thickness of 5 drawing unit.