libdvbv5: improve debug messages

libdvbv5: improve debug messages

Add several improvements at the debug messages:

	- Without verbose, show only the Virtual channels or
	  services to be stored in the file;

	- instead of using fprintf for errors, use the error
	  macros. That will make errors colored;

	- With verbose=1, will show all parsed data;

	- With verbose=2, will show all unparsed descriptors and
their hexdump contents;

	- With verbose=3, will show all descriptors and their
hexdump contents, including the ones without a parser.

Verbose levels 2 and 3 helps to detect if some improvements would
be needed inside the descriptor parser's library.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>