Don't get an error in find-file-hook
No sense in calling rc without a file name.
Apparently these headers do not work for us.
Simple integration with auto-complete.el

To use. Do the following:

(setq rtags-completion-enabled t)
(setq rtags-ac-completion-enabled t)

reevaluate rtags.el

start rdm like so:
rdm -a 5

 (or some other number larger than 0, this is the number of cached
 translation units so it will use some memory).

And it should just do its thing.
Remove this.
Ignore this.
Disable dabbrev clang completion if we're using ac. Might not be what
one wants. Maybe add option later.
Decrease count.
Kill this timeout. We really should just put these in a queue.
Close connection for rc --compile immediately and instead post an
event to ourselves to deal with it later. There's no feedback for this
so no reason to hold it up longer than necessary.
Bump rct
Allow querying for code-completion-enabled a little more thoroughly.
Put in some machinery to return non 0 for commands that failed. Not wonderful.
Clear out completion cache every once in a while.
Bump rct
Fix -w