Using poptPrintHelp()

[Pavel Roskin]

Hello!

> I suggest that we change print_mc_usage() to use poptPrintHelp().  This is 
> a standard popt function from src/popthelp.c, and it's already linked into 
> the mc executable.

Done.  Unfortunately, the help text is now rather poor, because nobody has
ever had a chance to see the option descriptions in this role.

On the positive side, it's much easier now to add more options, including 
the much needed replacement for "-P".

-- 
Regards,
Pavel Roskin