tab and newTab transitions

tabs have with & left transitions and newTab has left transitions of
0.15s
gives us a nice sliding effect
nest display err catching and tab sliding

Only show nest display if we have the cM variable
On close setTabWidths with param to only set newTab position
If we have that param, get values for the last tab by setting i to the
last tab, but if we don't have posOnlyNewTab set, we can set widths &
left pos's of tabs.
onMouseOut of tabsBar setTabWidths