arrange for error info about missing helpers to trickle up to the user

dockes dockes 2007-02-06

changed src/index/indexer.cpp
changed src/internfile/internfile.cpp
changed src/internfile/internfile.h
changed src/internfile/mh_exec.cpp
changed src/qtgui/preview_w.cpp
src/index/indexer.cpp Diff Switch to side-by-side view
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src/internfile/internfile.cpp Diff Switch to side-by-side view
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src/internfile/internfile.h Diff Switch to side-by-side view
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src/internfile/mh_exec.cpp Diff Switch to side-by-side view
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src/qtgui/preview_w.cpp Diff Switch to side-by-side view
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