streamline sort direction handling

we now use a boolean everywhere

correctly apply dynamic params to the search config

some form fixes for the dynamic filters

moved the filter reducing to Search

flatten array returned for URL parameters

fixed naming

added tests for dynamic parameters

Replace magic number with something obvious

If the prefix 'plugin/struct/' is changed, it should be obvious what else has to be changed. That is not the case if the length-parameter for the substrin

Replace magic number with something obvious

If the prefix 'plugin/struct/' is changed, it should be obvious what else has to be changed. That is not the case if the length-parameter for the substring is magic 14.

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make sure page columns have a label

schemas and columns need to be known before init dyn params

renamed methods for more coherence

major refactoring of the whole table aggregation

this is still completely untested

make use of new constants for filter name

make dynamic parameters a bit better to handle

Now the aggregation class no longer needs to juggle around with ugly
strings but can simply call functions on the SearchConfigParameter class
to genera

make dynamic parameters a bit better to handle

Now the aggregation class no longer needs to juggle around with ugly
strings but can simply call functions on the SearchConfigParameter class
to generate new parameters.

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make admin interface available to managers. closes #31

build our own header links. closes #51

proper cache handling for aggregations. closes #50

keep aggregation renderer agnostic. closes #52

fix bug in aggregation with no filters. closes #54

added auto scheme option for URL

added tag type #10

new option to select distinct data through search

this is useful for aggregating exisitng data regardless of page context

filters need to be their own group in the SQL

make column context available to types

This allows renderers to access the column info. Eg. the tag type will
need the column's name to set up a filter parameter

added Url type #9