fix job-time-tracking and make it completely optional for debugging purposes...

fix job-time-tracking and make it completely optional for debugging purposes only (disabled by default)

before there was a single timer that was only started in one place but was evaluated for every fetchjob
now we map job <-> timer and also print some more debug info on what job it actually was

svn path=/trunk/KDE/kdepimlibs/; revision=1125435