Fix #95, Replaces conditionally compiled code with runtime conditional logic

[chillfig]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fixes Remove conditionally compiled code #95, Replaces conditionally compiled code with runtime conditional logic.

Testing performed

• local build and lcov

Expected behavior changes
The changes intend on making the code easier to understand and maintain. The code coverage now reaches 100% when DS_MOVE_FILES or DS_FILE_HEADER_TYPE are toggled to/from their non-default state.

System(s) tested on

• OS: Ubuntu 20.04

Additional context
N/A

Third party code
N/A

Contributor Info - All information REQUIRED for consideration of pull request
Justin Figueroa, Vantage Systems

[jphickey]

Would recommend changing this macro name. DS_MOVE_FILES should be gone entirely, and a new one line DS_MOVEFILES_DESTDIR exists instead