The first function removes all bootstrap values from the current tree.
In fact this removes any kind of annotation attached to tree branches (e.g. those generated by ´Compare tree topologies´).
The second function toggles whether bootstrap values of '100%' are displayed or not. This does not only affect the display, instead it really affects the tree itself (i.e. if 100%-bootstraps are visible they will be saved to tree files).
NOTES
If a tree does not contain any bootstrap values, toggling 100% bootstraps will set all bootstrap values to 100%.