share/SolidData.py: add basic support for accessing 'unassigned' reads for each sample; add new function 'get_primary_data_file_pairs' for locating csfasta/qual file pairs in specified directory.
share/SolidData.py: add basic support for accessing 'unassigned' reads for each sample; add new function 'get_primary_data_file_pairs' for locating csfasta/qual file pairs in specified directory.

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