Problem: No proper formatting of a C line comment after a statement.
Solution: Find the start of the line comment, insert the comment leader and
indent the comment properly.
Problem: When re-formatting with an indent expression the first line of a
paragraph may get the wrong indent. (Martin F. Krafft)
Solution: Apply the correct indenting function for the first line.
(Christian Brabandt, closes#9150, closes#9056)
