fix missing Abstract Keyword in Stf Generator Base Classes

Author: wahln

matRad/steering/matRad_ExternalStfGeneratorRayBixelAbstract.m

@@ -1,4 +1,4 @@
-classdef matRad_ExternalStfGeneratorRayBixelAbstract < matRad_StfGeneratorBase
+classdef (Abstract) matRad_ExternalStfGeneratorRayBixelAbstract < matRad_StfGeneratorBase
 % matRad_PhotonStfGeneratorRayBixelAbstract: Abstract Superclass for 
 %   external beam stf generators using the ray-bixel mechanism 
 %

matRad/steering/matRad_ParticleStfGeneratorRayBixelAbstract.m

@@ -1,4 +1,4 @@
-classdef matRad_ParticleStfGeneratorRayBixelAbstract < matRad_ExternalStfGeneratorRayBixelAbstract
+classdef (Abstract) matRad_ParticleStfGeneratorRayBixelAbstract < matRad_ExternalStfGeneratorRayBixelAbstract
 % matRad_ParticleStfGeneratorRayBixelAbstract: Abstract Superclass for
 % Particle Stf Generators using the ray-bixel mechanism
 %

matRad/steering/matRad_PhotonStfGeneratorRayBixelAbstract.m

@@ -1,4 +1,4 @@
-classdef matRad_PhotonStfGeneratorRayBixelAbstract < matRad_ExternalStfGeneratorRayBixelAbstract
+classdef (Abstract) matRad_PhotonStfGeneratorRayBixelAbstract < matRad_ExternalStfGeneratorRayBixelAbstract
 % matRad_PhotonStfGeneratorRayBixelAbstract: Abstract Superclass for Photon
 %   Stf Generators using the ray-bixel mechanism 
 %

matRad/steering/matRad_StfGeneratorBase.m

@@ -1,4 +1,4 @@
-classdef matRad_StfGeneratorBase < handle
+classdef (Abstract) matRad_StfGeneratorBase < handle
 % matRad_StfGeneratorBase: Abstract Superclass for Steering information
 %   generators. Steering information is used to guide the dose calculation
 %
@@ -418,7 +418,7 @@ function createPatientGeometry(this)
                     matRad_cfg.dispError('Invalid path array!');
                 end
 
-                optionalPaths = horzcat(fileparts(mfilename("fullpath")),optionalPaths)
+                optionalPaths = horzcat(fileparts(mfilename("fullpath")),optionalPaths);
             end
 
             if nargin < 1
@@ -429,7 +429,6 @@ function createPatientGeometry(this)
                 end
             end
 
-
             %Get available, valid classes through call to matRad helper function
             %for finding subclasses
             availableStfGenerators = matRad_findSubclasses(mfilename('class'),'folders',optionalPaths,'includeAbstract',false);