Bug Fix

- Fixed bug that was causing more non-unique UUIDs.  Here are the
  changes made:
    - Task.cpp, tasks are no longer provided with a UUID in Task::Task.
      This prevents the global context.task from being constructed before
      srandom/srand is called.
    - main.cpp, instead of srandom/srand (time (NULL)), it now uses
      struct timeval tv_usec member, which has a micro-second granularity,
      instead of time (NULL) which has a second granularity.  When
      "task add ..." is called in a unit test, several calls are made per
      second, this the random number generator is seeded with the same
      value.
    - Modified the unit test to cover all 6 tasks created, instead of
      5.

src/Task.cpp

@@ -38,8 +38,6 @@
 Task::Task ()
 : id (0)
 {
-  // Each new task gets a uuid.
-  set ("uuid", uuid ());  // No i18n
 }
 
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