Added constructor to set loggers in ZedLogFrame class.
Added scripts dep to build target in Makefile.
Fixed deadlock in ZedLogFrame.shutdown().
Fixed CompositeDataLogger initialisation in ZedLogFrame.
Minor bug fix in ZedLogFrame gui class.
Added initial command line interface.
Fixed some minor errors in ZedLog (i.e. the main class).
Updated TODO list and CHANGES.pod to reflect recent update.
Update being the addition of a command line interface.