Added support for keyword [APPEND] in raw files.

This changes the behaviour of ACLs defined after this keyword.
The ACL is no longer prepended, but it is appended to a Netspoc
generated ACL. It is appended at the end of an ACL,
but before the trailing "deny any any" entry from Netspoc.
Fixed missing-approve: Check newer compare

If last compare found diff and if it occured later than last approve,
then show missing-approve.
v1.080

 - Added support for keyword [APPEND] in raw files.
   This changes the behaviour of ACLs defined after this keyword.
   The ACL is no longer prepended, but it is appended to a Netspoc
   generated ACL. It is appended at the end of an ACL,
   but before the trailing "deny any any" entry from Netspoc.

 - Fixed missing-approve: If last compare found diff and if it occured
   later than last approve, then show missing-approve.