Picard release 1.74

Picard release 1.74
http://picard.sourceforge.net/
30 July 2012
- Added a new "ProgressLogger" class that facilitates more useful and
standard progress logging for any program that iterates through a stream
of SAMRecords.  Adapted most command line programs to use it.
- Add support for targetedPcrMetrics and collected common HsMetrics and
TargetedPcrMetrics behavior into TargetMetricsCollector
- New program CollectTargetedPcrMetrics
- MultiHitAlignedReadIterator.java: Handle case where an alignment
record has no cigar elements that consume both the read and the
reference (e.g. the read is all soft-clipped)