Add path to errors

Start with lib/usePantry.ts and libexec/sort.ts for the missing-pantry error, then inspect the cellar failure path referenced through useCellar.ts. Trace how pantry and installation paths are selected; done means the relevant path is printed for both missing-package and cellar repair errors.

One thing I've noticed about making packages is that when there are errors it's hard to know exactly where I should go hacking. The reason why is because I know pkg does some magic when you cd to the pantry repo directory. So I'm just confused about what exactly is going on when it can't find things.

Here's some examples.

> pkg build khronos.org/opencl-icd-loader
error: Uncaught Error: Not in pantry: khronos.org∕opencl-headers

https://github.com/teaxyz/pantry#contributing
      throw new TeaError('not-found: pantry: package.yml', {project}, )
            ^
    at https://deno.land/x/libtea@v0.6.2/src/hooks/usePantry.ts:49:13
    at project (https://deno.land/x/libtea@v0.6.2/src/hooks/usePantry.ts:50:5)
    at Object.getDeps (file:///opt/tea/tea.xyz/brewkit/v0.44.1/lib/usePantry.ts:30:21)
    at file:///opt/tea/tea.xyz/brewkit/v0.44.1/libexec/sort.ts:24:29
    at ascend (https://deno.land/x/libtea@v0.6.2/src/plumbing/hydrate.ts:62:31)
    at ascend (https://deno.land/x/libtea@v0.6.2/src/plumbing/hydrate.ts:88:19)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async go (https://deno.land/x/libtea@v0.6.2/src/plumbing/hydrate.ts:93:5)
    at async hydrate (https://deno.land/x/libtea@v0.6.2/src/plumbing/hydrate.ts:102:7)
    at async file:///opt/tea/tea.xyz/brewkit/v0.44.1/libexec/sort.ts:23:13

I know why the above error is thrown. But it seems that sometimes if I build something locally that I don't get the error. It would be nice if the error told me the path of the pantry because I want to manually add the missing project so I can build the next one I'm working on.

Here's another example. I have no idea what this does, so I ran it to find out.

> pkg cellar -R
repairing: micro-editor.github.io
repairing: deno.land
repairing: deno.land
repairing: deno.land
repairing: deno.land
repairing: libpng.org
repairing: khronos.org/opencl-headers
repairing: zsh.sourceforge.io
repairing: pcre.org
repairing: pcre.org
error: Uncaught Error: not-found: pcre.org=2.0.0
      throw new Error(`not-found: ${pkgutils.str(installation.pkg)}`)
            ^
    at Object.resolve (https://deno.land/x/libtea@v0.6.2/src/hooks/useCellar.ts:78:13)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async link (https://deno.land/x/libtea@v0.6.2/src/plumbing/link.ts:9:24)

So something is broke with pcre.org. But I don't know which one, the main install or the repo. Well, I played with it and figured out it was the main install. But it would be nice if paths like this were printed.