Clarify QAI error when run has not started

Weiyan had configured the layout for the 23 Sep run, but hadn't started it on the MiSeq, when Richard H. noticed this error on the QAI MiCall page:

Run 23-SEP-2016.M01841 has no SampleSheet.csv file.

The page is looking for the run in the RAW_DATA folder, and that doesn't get created until the run starts.

Get rid of the confusing error message, and just check for the needsprocessing file. If it doesn't exist, display the error message, "Run is not ready for processing by the MiCall pipeline." If the needsprocessing file exists, but not the doneprocessing file, display the error message, "Run is not finished processing by the MiCall pipeline."

Here's the timeline:

• user creates layout in QAI, and SampleSheet.csv gets written to /media/macdatafile/MiSeq/sample_sheets
• user starts run on MiSeq, and the run folder gets created under /media/raw_data/MiSeq/runs in the first few minutes
• within about an hour, SampleSheet.csv gets written to the run folder
• at the end of the run, the FASTQ files are written to the run folder, and a needsprocessing file gets created by Conan's script
• the MISEQ_MONITOR notices the needsprocessing file, and uploads everything to Kive
• the MISEQ_MONITOR notices when Kive finishes, downloads the results to the run folder, and uploads the summary to QAI

Start at the QAI MiCall page and search for the existing “has no SampleSheet.csv file” error. Trace how the run folder and needsprocessing and doneprocessing files are checked. Done means the page shows the specified not-ready or not-finished message for each marker-file state.