Cleanup: Coding style updates and miscellaneous fixes.

Cleanup: Coding style updates and miscellaneous fixes.

Use fewer macros.

Update documentation in regards to return codes and related functions (much more work is needed here than is currently done).

Reduce nesting where obviously possible.

Fix typos and mistakes in words for documentation, comments, and prints.

Use "(pipe)" for designating the pipe input source.

Correctly identify last file when getting file name string.

Fix naming mistakes in programs where the "_read" is missing.

Add appropriate newlines to get code more up to date with latest practices.

Update comments to start with upper case letter where noticed.

Fix ordering of functions where they were noticed to be out of order.