cache finders created by 'build_finder_for' for reuse

Originally posted on Trac by gaspard Original Trac Ticket

 Description

This could be a great performance improvement for typical uses like 'table of contents' ... 'content' type of pages.

If two calls to build_finder_for generate the same ruby code, they should share the same variable name :

 -->
...
 --->

To make this work we need to make ruby variable name generation global ('var1', 'var2', 'list1', 'list2') so that we do not overwrite old variable content with new finders.

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