Cosmetic changes for bms_adaptor

Add notes about not to copy around or touch CSV files before being
processed by the bms_adaptor's worker thread, since such operations
will update all timestamp information in their inode structure and
consequently break down the worker thread's attempt to organise and
handle CSV files based on their last modification time.
Merge pull request #54 from Qingtao-Cao/devel

Cosmetic changes for bms_adaptor