make st_printf %P and %I variants take a 'struct subnet' as argument instead of 'struct subnet *'
a pointer can make the programm crash, a borked struct subnet can only make it print CRAP

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
add regtest for 'remove file ....'

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
fix memory alloc in subnet_remove

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
make missing_routes fill a struct subnet_files
allowing to print that files against a dynamic FMT

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
add comment about endianness issues for ipv6 adresses

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
change version to 0.5 in preparation for new release

Signed-off-by: etienne basset <etienne.basset@numericable.fr>
space/ indent issues ;

Signed-off-by: etienne basset <etienne.basset@numericable.fr>