Enable rounding and processing of writing of doubles to be optional

[michael-okeefe]

Pre-Conditions

In #34 we have confirmed that allowing a double to be written directly to string WITHOUT rounding or further processing is significantly faster than the current DoubleToString methodologies.

Problem

Writing of double values with processing for rounding and cleanup for dropping zeros is slow.

Proposed Solution

We desire to keep the current behavior for generating "presentation-quality" files but we want to enable a "speed-write" mode that tries to write out as quickly as possible. As such, we should add a new flag to the erin run subcommand (e.g., --speed-write) that will disable all rounding and text processing and just write raw doubles (and other data) as quickly as possible to the CSV output files.