Remove dead code

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Replace EventsModel::Filter operator with acceptEvent method

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Bug #150 fixed: move sorting routines to separate proxy model

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Remove dead code

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Remove dead code

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Reintroduced filtering by event level

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Move filtering by level to proxy model

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Remove dead code

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Move filtering by type to proxy model

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>
Move filtering by day to proxy model

Signed-off-by: Rafał Malinowski <rafal.malinowski@corp.bluecherry.net>