* src/document.cpp, src/document.h, src/sp-conn-end-pair.cpp,

*  src/document.cpp, src/document.h, src/sp-conn-end-pair.cpp,
       src/connector-context.cpp, src/conn-avoid-ref.cpp:

    Keep a seperate connector router for each document.

    *  src/libavoid/Makefile_insert, src/libavoid/connector.cpp,
       src/libavoid/connector.h, src/libavoid/debug.h,
       src/libavoid/geometry.cpp, src/libavoid/geometry.h,
       src/libavoid/geomtypes.h, src/libavoid/graph.cpp,
       src/libavoid/graph.h, src/libavoid/incremental.cpp,
       src/libavoid/incremental.h, src/libavoid/libavoid.h,
       src/libavoid/makepath.cpp, src/libavoid/makepath.h,
       src/libavoid/polyutil.cpp, src/libavoid/polyutil.h,
       src/libavoid/router.cpp, src/libavoid/router.h,
       src/libavoid/shape.cpp, src/libavoid/shape.h,
       src/libavoid/static.cpp, src/libavoid/static.h,
       src/libavoid/timer.cpp, src/libavoid/timer.h,
       src/libavoid/vertices.cpp, src/libavoid/vertices.h,
       src/libavoid/visibility.cpp, src/libavoid/visibility.h:

    Upstream changes to libavoid that allow multiple connector
    router instances, as well a few other minor bugfixes.