Overall improvements

This release improves the command line installation of deepTools, warning the user when some dependencies are not found.

In regard to the heatmapper we fixed a problem with overlapping labels and overlapping cluster/group names.

Also we changed the default behaviour of computeMatrix to be verbose by default. This is to warn the user of potential problems with the BED regions usually related to duplications and regions with no signal. We also added automatic mapping of chromosome names with and without chr.

For bamCoverage we changed the behavior: now, genome regions without read coverage show a zero. Before, such regions where not part of the bedgraph/bigwig output.