update to bootstrap 2.3.2

from http://getbootstrap.com/2.3.2/
removed the min css/js files, cause we don't use those
(I like to be able to inspect the code in the browser,
make changes, etc)
re-install cyborg for bootstrap 2.3.2, from http://bootswatch.com/2/cyborg/
make inputs dark (same tweak as a year ago)
[better] tooltips for tag labels

* tooltips for aggregated tags labels,
  showing all contributing values
* just better tooltips overall
more 'what' -> 'unit' tag migration

* update auto-conversion from plugins; unset what tag
* make sure unit always goes first, like what used to be
sort tags better, in graph titles and legend
give n1/n2/n3/... tags clearer and consistent coloring
make tooltips work

bootstrap needs to be loaded after jquery for tooltips to work.
note: this means we load jquery and bootstrap twice in GE.
the alternative is that we remove the whole
templates/snippet.graph-deps.tpl and just add all unique
dependencies to templates/page.tpl;
but then embeddability is endangered/broken:
graph html should load all its JS so that you can
easily embed it anywhere.
make tooltips and embeds work at the same time.

now requestors should be explicit as to how if they want the
ajax response to include the dependencies or not,
this way we can make it work in all cases.

also, don't load jquery/bootstrap again as part of the deps,
cause that would break tooltips
add embed example