Bug-fix: Undo logic error in how database timestamp filtering criteria was set (fixes #69).

[kirkrodrigues]

References

#69

Description

• The timestamp filtering criteria for filtering files from the database was flawed: It only returned files that fit entirely within the given timestamp range, rather than also returning those which partially overlapped with the given timestamp range.
• This change fixes that and adds a comment so the next developer doesn't make the same silly mistake.

Validation performed

• Compressed the dataset mentioned by the issue.
• Verified the searches mentioned by the issue worked.
• Verified that searches with a timestamp filter that overlapped with a certain file's timestamp range worked, no matter if it the overlap was a complete or partial.