Recover performance by disabling debug

With profiling, this goes from 20 to 6 seconds. Without profiling, I've
seen something like from 6 to 2 seconds.

Feel free to reenable this code if you figure out how to make it cheap.
Comment ConsoleLogT implementation back in.

This doesn't change performance because the functions are never called.
Configure --debug=typing support at compile time.

The computationally expensive --debug=typing feature is now disabled by
default. If you want to be able to use the --debug=typing feature, you
have to compile pts with:

  cabal install -fdebug-typing
Make remaining call to log conditional
Merge pull request #2 from Toxaris/pr/88

Provide compile-time flag for avoiding debug overhead
Merge pull request #88 from Blaisorblade/topic/performance-2

Recover performance by disabling debug
Ensure Emacs loading code logs errors (for #85)

I needed this because I did have errors (that's because on OS X it takes
effort to get a reasonable PATH, so you need to first load a MELPA
package to get it to work and only *after* you can do these things).