v1.12.17.2

-- Fix issue found by Meryem where dc and dod processing results weren't being saved between homer3 sessions because of the space saver feature which only auto-recalculated dc and dod at the start of a homer3 session if there was dcAvg or dodAvg found. Removed this for now because this whole way of doing it needs a little rethinking because all it addresses is saving to disk but it does not address the problem of keeping the whole huge thing in memory during the homer3 session. So I removed the action for now and added MemoryRequired method for DataTree classes to calculate meory required and automatically to spacesaver property in GroupClass on or off. Then in future releases we will use it to calculate dc and dod on the fly when user selects currElem in MainGUI.m

-- Fix matlab exception in hmrR_PCAFilter when calculating pro stream reported by Meryem.

-- Fix matlab exception in hmrG_SubjAvg when dcAvg is not generated by proc stream (because the run level block average isn't part of the proc stream) but we're calculating subject average at the group level anyway.

-- Improve aux display in MainGUI to not obscure other data.

-- Add user function hmrR_OD2Conc_new to incorporate improvements in that function but keep the old hmrR_OD2Conc for unit testing until unit test are rerun for homer2 with the new hmrR_OD2Conc. But default proc stream config file will use the new version of hmrR_OD2Conc

-- Fix false reporting of presence of dc and dod in currElem in EnableDisableGuiPlotBttns.m