Initialise the logging of clj-libssh2 by applying trace-ns to all of the
namespaces in the library if debug logging is enabled.

Given an object, trim down the larger items so that logging them doesn't
result in a combination of extreme performance degradataion and lack of
readability.

Arguments:

object The object to summarize.

Return:

An object of the same type and shape as the input, but with the larger parts
of the object summarized into a brief description of their contents.

Hook a function so that all calls to it (and the results of those calls) are
logged at a given level.

Arguments:

fn-var A var pointing to the function to trace.
level  The log level at which the function call and result should be logged.

Return:

See robert.hooke/add-hook for the description of the return value.

Apply (trace-fn % level) to all functions in a given namespace.

Arguments:

ns-sym The symbolic name of a namespace.
level  The level to log all calls at.

Return:

nil