Adding filtering 'metadata' channel to formattedDump v2

User can still have them with -M option.
Small changes for optimization: Parse options only one time at the init until
everytime.
Small indentation problem corrected.

Signed-off-by: Vincent Attard <vincent.attard@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>