Drop call to before_all in nested - should be called anyway by run!
Add empty help hash if no help defined when calling run!
Add IO convenience methods for displyaing output and getting responses
Test for @@_help before assuming it exists in nested parser (140)
Set IO to output on $stderr - testing in RL to see if this is workable
Added in a sort of man facility with --man to print out all the help in one go
Clean up spacing etc
Add instance attribute to read options hash