Standardize parentheses around require/include statements
|Reported by:||nacin||Owned by:|
99.9% of the time, require and include (and *_once) statements don't need parentheses.
All but about 10 instances, these statements use parenthesis. We should either remove all of them (personally, less parentheses is always good) or make it a coding standard to always have them, and add them to the remaining instances.