Add missing break.

This caused an infinite loop in Parrot when trying to read /proc/pid/mem.
diverted_length should be size_t
don't use debug in tracee process
Remove unused pfs_process fields.
Improve execve use of scratch space.

o Allows execve to handle more arguments.

o Because the Parrot scratch space is in the unused part of the stack, we don't
  actually need to restore the memory there. I have removed the related code that
  would restore the tracee's old garbage stack memory.

o The size of the scratch space has increased from 1 page to 8 pages.

o Writes/reads to/from tracee memory are batched.
Add missing break.
Should be passing &fl to pfs_fcntl.
Remove any unnecessary differences for dispatch.

Used this command to help:

$ diff -au <(sed 's/SYSCALL32/SYSCALL64/g' pfs_dispatch.cc) pfs_dispatch64.cc
Forgive leading spaces when reading file lists and macro definitions.
Merge branch 'fix_cmd_lexing'
Merge remote-tracking branch 'ccl/pull/618/head'

* ccl/pull/618/head:
  Remove any unnecessary differences for dispatch.
  Should be passing &fl to pfs_fcntl.
  Add missing break.
  Improve execve use of scratch space.
  Remove unused pfs_process fields.
  don't use debug in tracee process
  diverted_length should be size_t
  Add missing break.
Fix whitespace and use return not exit.
If convert program cannot be found, fail.
Merge branch 'makeflow-test'

* makeflow-test:
  If convert program cannot be found, fail.
  Fix whitespace and use return not exit.
Fixed confusion in the configure process:
Removed build of chirp_client.so, which was generally unused and causing build headaches.
external_dynlibs is now simply the set of dlls used by all processes in the build.
abspath goes in configure.tools
Removed unused MPI dependency and code.
Removed unused Kerberos support.
Added the --single-shot option to the worker to cause it to exit quickly
after the master disconnects.  This accelerates the test suite by eliminating
a fair amount of idle waiting.
Eliminate use of kill from test scripts, this has an unavoidable
race condition which can accidentally kill off unrelated processes
when the system is busy.