illumina2cluster/analyse_illumina_run.py: 0.1.5, improvements to summaries for projects.

Updated the describe_project() function to generate improved descriptions of each project, now including whether the data for samples is split across multiple fastq files.
illumina2cluster/analyse_illumina_run.py: 0.1.6, make verify against sample set a separate function.
illumina2cluster/analyse_illumina_run.py: 0.1.7, added --summary option.

New --summary option generates a one-line summary of projects and numbers of samples
which is suitable for logging files etc.