Fix the copyright notice.
Use the new DLT_BLUETOOTH_HCI_H4_WITH_PHDR DLT, and add a
direction indication.
Now that we have a direction indication, support
pcap_setdirection().
Update FILES and INSTALL.txt appropriately, and fix some problems in
INSTALL.txt.
Linux. The USB sniffing code for Linux now supplies a per-packet header
based on the one supplied by the Linux binary sniffing interface, so we
add a new DLT_ value and use that.
Fix his e-mail address, and add him to the credits.
a Bluetooth socket as an error - it just means there's no Bluetooth
support in the kernel, and thus there are no Bluetooth devices.
Clean up error messages a bit, including indications that these are from
the Bluetooth code.
Clean up some comments.
Protect all references to the USB stuff from the common Linux code with
PCAP_SUPPORT_USB, just as references to the Bluetooth code are protected
with PCAP_SUPPORT_BT.