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removed safemode hack

Safemode has been removed in PHP 5.4.0. We finally no longer need to
deal with this insanity.

show other errors in undefined settings again

This reestablishes the mechanism of adding errors as Sepcial classes to the
undefined list.

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shortened new search configs

shorter names are more in line with what we already use, makes less
layout problems in the documentation and is easier to type when telling
people about it.

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feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
fro

feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
from a page within a deeper namespace, the first X namespaces will be
added as filter.
Possible use case could be with language namespaces to ensure that the
default search is initially within the current language.

`search_default_fragment_behaviour`:
Option to specify the default fragment search behavior

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