2318: focus on CssBoxCollection
2139: original 'List' version
2140: LinkedList?

attempt to change List<CssBox> in CssBoxCollection
to LinkedList<CssBox>, +Errs
2141: fix correction error
2142
2326
Merge branch 'v1.7.2139LL' into v1.7dev
Merge branch 'v1.7dev' into v1.7