boost foreach fix

corpus2tools/corpus2get.cpp

corpus2tools/tagset-tool.cpp

libcorpus2/ann/annotatedsentence.cpp

libcorpus2/ann/channel.cpp

libcorpus2/ann/view.cpp

libcorpus2/chunk.cpp

libcorpus2/io/cclreader.cpp

libcorpus2/io/cclwriter.cpp

libcorpus2/io/conllwriter.cpp

libcorpus2/io/iob-chan.cpp

libcorpus2/io/orthwriter.cpp

libcorpus2/io/plainreader.cpp

libcorpus2/io/plainwriter.cpp

libcorpus2/io/premorphwriter.cpp

libcorpus2/io/reader.cpp

libcorpus2/io/reader.h

libcorpus2/io/rft.cpp

libcorpus2/io/sax.h

libcorpus2/io/statwriter.cpp

libcorpus2/io/writer.cpp