[feature-request] different output folders for *.h and *.c and dummy conf file

Hi Lorenzo,

my first feature were different output directories for cmdline.h and cmdline.c files. The only setting for now is --output-dir. If I have a directory structure where include files are in include and source files are in src and I want to dynamically create cmdline.* files I must manually copy them to appropriate directories. Where is possible to define --output-header-dir and --output-src-dir? If neither is defined just use --output-dir of default location.

the second feature were to create a dummy config file based on the *.ggo one, so that it contains all possible configuration options with their default values and descriptions, but commented out. One can use such a file as example. And it is the very simple to update this conf file if *.ggo one will be changed. For example: gengetopt --make-dummy -i *.ggo

Thank you in advance.

Best regards,
Yegor