Add: data collection to file for at most two days

Added data collection loop that collects data over the course of
at least one full day and at most two full days. Data is collected
into a file based on the month, day, and year, with file name of
the form MM_DD_YY.data. For each day there is also a log file that
indicates any errors that happened, and the time at which they
occurred. It is named MM_DD_YY.log.

Presently, the script only takes data from OCR, and changing that
requires changing the program itself.