make_reports_index: use summaries rather than full reports
make_reports_index: use summaries rather than full reports

When possible, use summaries rather than full reports. Create summary
from the full report if it does not exist yet.

boklm/tbb-testsuite,gunesacar/tor-browser-bundle-testsuite,gunesacar/tor-browser-bundle-testsuite,boklm/tbb-testsuite,gunesacar/tor-browser-bundle-testsuite,boklm/tbb-testsuite,gunesacar/tor-browser-bundle-testsuite,boklm/tbb-testsuite,boklm/tbb-testsuite