completions, using an external helper just for functions and modules
completions. This is overally slower, as our helper outputs all available
modules at once, rather than just one piece of namespace, but this is
more in line with other completions
Turn it on dynamically when needed instead; see doc/styleguide.txt for
a longer explanation. This fixes many non-filename completions which
had been previously more or less broken due to unwanted
escape-as-filenames behavior.
