Fix speed issues for bash subshells Fixes issue #5 https://github.com/jml/undistract-me/issues/5
Fix speed issues for bash subshells
Fixes issue #5 https://github.com/jml/undistract-me/issues/5

The issues seems to be that pre-exec thinks we are running in a subshell in
this case.  Remove this code to always clear the debug trap irrespective of
bash subshell level.

Before we have this:

  % time (for i in {0..512}; do true; done)

  real    0m8.657s
  user    0m0.424s
  sys     0m0.976s

After we get:

  % time (for i in {0..512}; do true; done)

  real    0m0.026s
  user    0m0.012s
  sys     0m0.000s

edelvalle/undistract-me,jml/undistract-me