1. Add an ExecutionSummary object to record execution
information about Ceres objects.
2. Add an EventLogger object to log events in a function call.
3. Add a ScopedExecutionTimer object to log times in ExecutionSummary.
4. Instrument ProgramEvaluator and all the linear solvers
to report their timing statistics.
5. Connect the timing statistics to Summary::FullReport.
6. Add high precision timer on unix systems using
gettimeofday() call.
7. Various minor clean ups all around.
Change-Id: I5e09804b730b09535484124be7dbc1c58eccd1d4
report execution statistics of all kinds.
Currently a single map which maps arbitrary strings to doubles is supported,
which allows for precise timing information to be communicated.
Change-Id: Ibd930aca5c9e6cae89bcfeffe9b13e2887644881