Initial attempt at updating script to handle multiple loggers

Added a variable to settings.ini & changed names of some others
Started moving around code to accomodate a loop by logger/site
Not yet functional
Replaced print messages with logging

Using logging library.  Creates or updates UploadOttData.log.
Incomplete progress on multiple loggers

Not yet done.  To Do: update settings with benchmarks variable &
integrate multiple benchmarks into script.
Multiple site upload working.

Added new variables to settings.ini & modified script flow to incorporate multiple sites.
Must manually add benchmarks (or offsets, or zero elevations) to each site.