Remove prematureExit/exitStatus, and implement in task main loop

Use the previous commit on returning success from each task execution
function, and implement handling of errors in the main loop. Add a
script with which this is visible using Custom_Commands.

ci-scripts/cls_oai_html.py

@@ -446,6 +446,8 @@ class HTMLManagement():
 				self.htmlFile.write(f'        <td bgcolor = "lightgreen" >{status}</td>\n')
 			elif (str(status) == 'KO'):
 				self.htmlFile.write(f'        <td bgcolor = "lightcoral" >{status}</td>\n')
+			elif str(status) == 'SKIP':
+				self.htmlFile.write(f'        <td bgcolor = "lightgray" >{status}</td>\n')
 			else:
 				addOrangeBK = True
 				self.htmlFile.write(f'        <td bgcolor = "orange" >{status}</td>\n')