This change the single select box into a checkbox which toggles the
mod on/off. If the mod is "on" and it has multiple versions, then
a selection list will be shown with the various possible versions.
If there is only a single available version, then the selector is
not shown.
* The "Show Plan for Tools" link should open a new window each time
it is clicked (i.e., don't re-use the same window)
* Further customize the title of the crafting page to give some
indication of what is being crafted
When hovering over a quantity in an inventory display, if the
quantity is larger than one stack (i.e., 64 items), display a
tooltip showing the quantity in stacks (plus the remainder).
Instead, any time a change is made which invalidates a crafting plan,
update the visual display to show that the plan is out of date, and
add some extra affordances to recalculate.
* When evaluating a plan, only give the pass-through treatment to
items if the step they're part of was actually executed
* When marking a step "complete", ignore passthrough items
Andrew Miner