Update on fork and join support: support before mapping (TML, simulation)

src/tmltranslator/TMLActivity.java

src/tmltranslator/TMLActivityElementChannel.java

src/tmltranslator/TMLAttribute.java

src/tmltranslator/TMLChannel.java

src/tmltranslator/TMLMapping.java

src/tmltranslator/TMLModeling.java

src/tmltranslator/TMLTask.java

src/tmltranslator/TMLTextSpecification.java

src/tmltranslator/TMLWriteChannel.java

src/tmltranslator/tomappingsystemc2/MappedSystemCTask.java

src/tmltranslator/tomappingsystemc2/TML2MappingSystemC.java

src/ui/window/JDialogSystemCGeneration.java