refactor operations delegated to subsequence by sortseq and filtspec into superclass

dockes dockes 2009-01-15

changed src/query/docseq.h
changed src/query/filtseq.cpp
changed src/query/filtseq.h
changed src/query/sortseq.cpp
changed src/query/sortseq.h
src/query/docseq.h Diff Switch to side-by-side view
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src/query/filtseq.cpp Diff Switch to side-by-side view
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src/query/filtseq.h Diff Switch to side-by-side view
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src/query/sortseq.cpp Diff Switch to side-by-side view
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src/query/sortseq.h Diff Switch to side-by-side view
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