Remove picard requirement

[magicDGS]

It looks like ReadTools is handling everything now, and picard won't be required for distmap. There are usages in:

• [x] DataMerge.pm - this package should be deprecated in favor of DataDownloadAndMerge
• [x] DataProcess.pm - this package should be deprecated in favor of DataDownloadAndMerge
• [ ] GenomeIndex.pm - remove copying of picard files to the archive
• [x] HadoopMapping.pm - only required for passing to bin mapper scripts, but unused there
• [x] bin mapper scripts - unused argument in some of them
• [ ] DownloadTrimmedRead.pm - actually I don't understand why this is required here...
• [ ] TrimDataMerge.pm - this whole package should be deprecated
• [x] Utility.pm - only for logging errors/warnings (not a problem)

[magicDGS]

@robmaz - when I was looking at the part for the mapper scripts, I realized that there is a single usage in distmap for picard.jar - see #80 for more information

[magicDGS]

I am not sure if it would be really necessary to store the parts as BAM files in the mappers, but ReadTools handle SAM or BAM while downloading independently (depends on the extension, I guess)

[magicDGS]

@robmaz - could you have a look to this one? I think that it should be removed completely in the next iteration (I realized that you already bump to beta)