Upgraded the index feature.

1: The index itself is computed so that the _change_ in index value
   between any two points in time indicates the average performance
   increase during this time period in terms of a log2-based
   difference. An index value _change_ of 1, 0, and -1 thus
   indicates a doubled, unchanged, and halved performance respectively.
   (The corresponding linear factors would be 2, 1, and 0.5.).

   Note: Individual index values bear no useful meaning when regarded in
   isolation. The graph is however shifted vertically so that each
   individual index value indicates the change from the index value at the
   given base time (the index value of the latter is then 0 and 1 in the
   log2 and linear domain respectively).

2: Clicking on a particular data point in the index graph now opens a
   page that shows the top-10 results histories that contributed most
   significantly to this particular change in the index value.

   Each contributor graph indicates the data points that were used for
   computing the contribution for this index value.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/bm/bm.pro b/src/bm/bm.pro
index ca971d1..cff490b 100644
--- a/src/bm/bm.pro
+++ b/src/bm/bm.pro
@@ -1,8 +1,8 @@
 TEMPLATE = lib
 CONFIG += shared
 TARGET = bm
-SOURCES += bm.cpp bmrequest.cpp bmmisc.cpp plotter.cpp resulthistoryinfo.cpp cache.cpp
-HEADERS += bm.h bmrequest.h bmmisc.h plotter.h resulthistoryinfo.h cache.h
+SOURCES += bm.cpp bmrequest.cpp bmmisc.cpp plotter.cpp resulthistoryinfo.cpp cache.cpp index.cpp
+HEADERS += bm.h bmrequest.h bmmisc.h plotter.h resulthistoryinfo.h cache.h index.h
 QT += network
 QT += xml
 QT += sql