The main goal of the merge request is to save the eFEX tau isolation variables to EDM. To do this required updating the execute functions in eFEXFPGA, eFEXSim, eFEXSysSim classes to use eFEXtauTOB objects, rather than raw tobwords. Also made changes to eFEXtauTOB object variables/functions, as it was previously unused and had just been copied (without modification to handle taus) from eFEXegTOB. As discussed with @watsona, @nicholas.