add the peek option

This replaces the handling of the sneakyindex mechanism by being more
clever.

revamp config options and tests

added option to sort namespaces before other pages

Refactor item gathering and sorting

This fixes the broken sort by title mechanism

new top level filter mechanism

Adding the option filter to the syntax adds a mechanism to filter the
list at the top level. The current filter is preserved through
navigation via session storage.

Add option for natural sorting and make it default

The search(...) function creates per default a natural sorted array.
This behaviour is now enforced by adding an explicit 'natural'
parameter. Sort

Add option for natural sorting and make it default

The search(...) function creates per default a natural sorted array.
This behaviour is now enforced by adding an explicit 'natural'
parameter. Sorting by the ascii table in now an option in the config
menu.

Add files for the configuration and add a test for the 'natural'
sorting.

However the ascii sorting is still broken and will be fixed in a later
commit. Currently the pages of an open namespace are not always below
the open namespace but below another one.

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