Merge branch 'threads'

This branch adds initial support for multithreaded targets, as well as
forking and exec syscalls.  All of the bugs from initial testing are
fixed so far.

* threads: (25 commits)
  Don't spin waiting to interrupt zombie process
  Allow termination and exec events to propagate immediately
  Implement support for PTRACE_EVENT_FORK and ui
  Handle PTRACE_EVENT_EXIT to capture a final state snapshot
  Detect out-of-band thread exec state changes to prevent deadlock
  Enable user creation of thread-specific breakpoints
  Add orig_rax to register display
  Tweak SCHEDULER_DELAY for use with installing breakpoints
  Ignore breakpoints during singlestep
  Fix bug with cleaning temporary breakpoints
  Independent thread control refactor
  Multithread version 3
  Add strict_strtoul
  Prevent lingering traps after detach
  Handle PTRACE_EVENT_EXEC
  Workaround SIGSTOP on child process startup
  setpgid is redundant with setsid and causes an error
  Display name of pending signal
  dbg_realcont for testing purposes
  Display installed status of breakpoints
  ...

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