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Remove != '' filter from queries

This effectively reverts dc7d8d08 (changes were moved to different files,
so it is more transparent to do this in a new commit).

Fixes issues with negative filters

Remove != '' filter from queries

This effectively reverts dc7d8d08 (changes were moved to different files,
so it is more transparent to do this in a new commit).

Fixes issues with negative filters #358 #380 #656

TODO: Correct filtering on prefixed/postfixed fields, like the original commit was supposed to do, but without side effects that break normal non-prefixed fields.

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Added test for username autocompletion bug #689

Page autocomplete: catch invalid regex

Page autocomplete: new option 'filter' instead of old 'namespace' and 'postfix'

Improve autocomplete search for pages

Fixes #579 special characters in ids
Implements #593 and #622 flexibility in namespaces via regex

Make all tests run with the new SQLiteDB class

Fix type errors with empty 'roundto' setting in decimals

more test fixes

tests should succeed again

Mostly replacements for PHPQuery were needed.

clean up for the tests

This mostly corrects file and class names for PSR-2. Function names have
not been adjusted yet