Reimplementation of prefix sets.
Prefix sets were broken beyond any repair and have to be reimplemented.They are reimplemented using a trie with bitmasks in nodes.There is also change in the interpretation of minus prefix pattern,but the old interpretation was already inconsistent with...
Sets of integers now actually work. Sets of IP will work as soon ascompare function is ready.
Filters upgraded - a bit. Moved code to filter.c because it is whereit belongs. (f-util.c stays there for auxiliary and non-important things.)
Filters, second try. This time they have their own directory.