Revise coding style and documentation requirements

This is unsorted list:

• opening curly braces on new line when the outside construct is multiline, e.g.

for (foo;
     bar;
     baz) {

vs current

for (foo;
     bar;
     baz)
        {

• Using parentheses to explicitly set priority in conditions, e.g.

((foo == TRUE) || (bar == FALSE))

vs current

(foo == TRUE || bar == FALSE)

• Explicit NULL or FALSE comparison

(foo == FALSE && bar == NULL)

vs current

(!foo && !bar)