Products.extendedpathindex

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- Relaxed a check for path only allowing strings so far. Now we except all
basestrings. This closes http://dev.plone.org/plone/ticket/5617.
[hannosch]

- Converted log infrastructure to use Python's logging module instead zLOG.
[hannosch]

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- Added some extra debug information when an improper path is cataloged.
[sidnei]

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- Add seperate index structures on the parent path and the full path of all
objects. This significantly improves scaling for navtrees, breadcrumbs,
and listings.
[alecm]

- Assume that EPI is used inside same container as content and use relative
search instead of absolute - basically transforming / plonesite search
to / search with startlevel set to 1 instead of 0.
[tesdal]

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- Implement 'indexed_attrs' support for ExtendedPathIndex.

- Prevent navigation tree queries from stopping prematurely if the
queried-for path does not actually exist in the index, but its parents do.

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- Path index capable of generating a navigation tree structure from
cataloged data.