fix z-index for all elements

[fat]

this is a tricky annoying problem because of the relationship between the topbar and modal elements and how popovers/dropdowns/etc aren't children of modals.

Currently all dynamic things are shown beneath the modal which is incorrect.

[pokonski]

Would setting appropriate z-index'es from JS plugins be a viable option?

Example: in case of Tooltips inside modals, traversing upwards until we find a parent (of the element that triggered the Tooltip) with z-index present and then we set a higher z-index for the Tooltip itself.
Or simplified case: look for the closest parent .modal and set z-index to a higher one - easier to do.

[XORwell]

i've had the same idea. (traversing upwards)
i think that setting z-index'es from JS plugin is a viable option.

[pokonski]

I could take a stab at this but I don't handle rejection well :P.

[mdo]

Closing for #1221.

[purwandi]

This issue is still going on bootstrap 2.1.1 see #4980