Improve 'rebuild index' under Windows: this often failed because of some

open files in the Xapian db (could not be deleted under windows).
Now only fails if a preview has been opened, and a GUI restart fixes the
situation.

Jean-Francois Dockes Jean-Francois Dockes 2018-01-20

changed src/qtgui/rclm_idx.cpp
changed src/qtgui/rclm_wins.cpp
changed src/qtgui/rclmain_w.cpp
changed src/qtgui/rclmain_w.h
changed src/qtgui/reslist.cpp
changed src/rcldb/rcldb.cpp
src/qtgui/rclm_idx.cpp Diff Switch to unified view
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src/qtgui/rclm_wins.cpp Diff Switch to unified view
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src/qtgui/rclmain_w.cpp Diff Switch to unified view
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src/qtgui/rclmain_w.h Diff Switch to unified view
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src/qtgui/reslist.cpp Diff Switch to unified view
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src/rcldb/rcldb.cpp Diff Switch to unified view
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