Cleanup: FSS Basic Read parameter processing, file variable related, and some ++/--.

Cleanup: FSS Basic Read parameter processing, file variable related, and some ++/--.

Simplify the parameter processing using an array to avoid repeating similar code.

Relocate the file variable so that it goes out of scope and is removed from the stack before processing.
The file variable is no longer needed during processing with the current design so don't hold it in memory after it is no longer needed.

Relocate the file stream close so that it doesn't need to be specified as many times in the code.

There are some ++/-- postfixes in use that would be better as prefixes (such as changing i++ to ++i).