Change accounts package I/O function file parameter

[kastolars]

Change I/O related functions to use file pointers/database connections instead of opening and closing excessively in the accounts package

https://www.vividcortex.com/blog/2015/09/22/common-pitfalls-go/

Example: This should instead be a parameter that is passed in

• [x] All accountstable package functions use database connections passed in
• [x] All accountstable tests pass
• [x] All usages of modified accountstable functions refactored

[HarryL5004]

Completed