Print the number of processed files and the elapsed time in gmathmltest.
Print the number of processed files and the elapsed time in gmathmltest.

The elapsed time is not accurate and depends on the number of file in the
testsuite. What we need for a better performance evaluation is the
rendering time for each file, extracted from a serie of run.

janmarthedal/mathml2svg,wavewave/lasem,gjtorikian/lasem,wavewave/lasem,janmarthedal/mathml2svg,janmarthedal/mathml2svg,gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,wavewave/lasem,gjtorikian/lasem