Adapted option handling in profile finding and validation functions to common pattern.
Added support for constant flow (unpumped) CTD data processing and other improvements...

  * Moved CTD flow speed computation in thermal lag correction to
    a separate function.

  * Adapted thermal lag estimation and correction functions to handle
    profiles with either constant or variable flow speeds, and improved
    graphic output code.

  * Adapted data processing function to changes in thermal lag  related
    functions.

  * Improved graphic output code in sensor lag estimation function.
Updated example configuration functions to track latest changes.
Cosmetic fix in documentation comment of function generating gridded data NetCDF product.
Updated README file and added processing outline diagram.