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Split up command into command, command_blocking, and command_looping. The original command no longer returns anything, which clarifies how it should be used in most cases. command_looping and command_blocking both return a command object. Also added a waiting CV to the Command object, though it is not used in command_blocking yet.
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Now, there is only one callback for command(), and it returns a const reference to the Command object. The user is responsible for error checking using c.ok(), c.status(), and getting the reply with c.reply(). This significantly cleans up the library code and the user code. Greatly refactored the data type specialization code in command.cpp.
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Added GTest under test/. Great for unit testing commands. Added some nice helper functions to make writing tests easy. Added options to CMakeLists to build the library, tests, and examples separately, configurable through ccmake. Also default the build type to RelWithDebInfo, but don't override user settings.