RNA-seq/bowtie_mapping_stats.py: add file name to reported sample number in output files when there are multiple input log files.
RNA-seq/bowtie_mapping_stats.py: add file name to reported sample number in output files when there are multiple input log files.

fw1121/genomics,fw1121/genomics,fw1121/genomics,fw1121/genomics,fw1121/genomics