Problem:    Still read modelines for ":doautocmd".
Solution:   Move check for <nomodeline> to separate function.

Problem:    There is no way to avoid ":doautoall" reading modelines.
Solution:   Add the <nomodeline> argument. Adjust documentation.

Problem:    Can't intercept a character that is going to be inserted.
Solution:   Add the InsertCharPre autocommand event. (Jakson A. Aquino)

Problem:    Can't use cscope with QuickFixCmdPre and QuickFixCmdPost.
Solution:   Add cscope support for these autocmd events. (Bryan Venteicher)