Fix DHCP error when multiple DNS or DHCP servers are returned.

When multiple servers were returned only the first was read so that
parsing of the remainder of the packet failed.

Following symlinks in arduino launch script for Linux.

Updating version to 0021.

Updating version to 0020.

Tagging release 0019.

Tagging release 0018.

Tagging Arduino 0017 release.

Tagging release 0016 (a little late, but it should still be right).

Tagging release 0015.

Tagging release 0014.