Generalize error parsing into one function using haskell-compilation-error-regexp-alist

This helps haskell-process to support the ferror-spans syntax, and
also the error jumping in haskell-interactive. My implementation of
-parse-error is lame, but it's general, anyway.

Ping @hvr
Another extension enabling case
Make error detection stricter
Ignore errors from haskell-docs
Support keyboard quit in haskell-complete-module-read
Make haskell-process-reload-devel-main prompt about DevelMain buffer
use notify instead of notifications-notify