Nfcpy

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* Fixes an error in in the authentication procedure for Ultralight-C
and NTAG21x Type 2 Tags.

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* The main new feature of release 0.11 is the support for encrypted
LLCP connections from the NFC Forum LLCP 1.3 Specification. The
feature is available for Linux systems with OpenSSL crypto library
(probably all). Encryption is automatically used if the supported by
the peer device.

* The Python USB library has changed from PyUSB to the libusb1
module (pip install libusb1). This allows to wait for a USB
response packet and still being able to cancel with keyboard
interrupt (which PyUSB was unfortunately blocking).

* Starting with this release the nfcpy library part (the nfc module
but not the examples) will be uploaded to the Python Package Index
for simple installation with 'pip install nfcpy'.

* The Type 2 Tag sector_select command could finally be tested with an
NTAG I2C Tag and is now working as intended.

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* Fixes an initialization issue when PN532 is connected to serial port
on Raspberry Pi.

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* Issue warning when nfc/clf/pn53x.py is atttempted to be used as a
driver (since version 0.10 pn53x contains only an abstract base
class, drivers are in pn531.py/pn532.py/pn533.py).

* Fixed an issue with PN532 deactivation - the chip needs additional
time after change of serial baudrate before the next command may be
send.

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* Complete update of the tag read/write implementation to support
features of specific tag products, such as password protection for
Sony FeliCa Lite-S and NXP NTAG.

* Type 4B Tags (ISO Tags) are now supported. This completes support
for all NFC Forum Tag Types.

* All contactless driver implementation is updated for generally more
stability and an improved low-level API. The contactless frontend
interface class and all ddrivers are now in one sub-package and emit
debug messages with the logger "nfc.clf".

* The TTA/TTB/TTF/DEP communication types are replaced by RemoteTarget
and LocalTarget types with enclosed communication parameters that
allow more control of the discovery process. This change is only
relevant for application code that has set specifc poll targets or
implemented card emulation code, otherwise it won't be noticed.

* The contactless frontend connect() method understands some more
options for callbacks and peer to peer communication settings.

* Serial (tty) readers can be automatically discovered by probing
ports and drivers. On Linux, the maximum serial baudrate is checked
and configured up to 921.6 kbaud (with a PN532). Note that automatic
port and driver discovery may disturb other serial devices and
should only be used if that is not a concern.

* New example tools use use the low-level driver API for very specific
tasks like pure remote target discovery (with the option to do this
repeatedly), listen to become discovered, and to simply observe when
an external RF field is switched on and off (requires a PN531/2/3).

* The tagtool.py and beam.py tools can inspect frequently encountered
permission problems and output targeted recommendations for solving
them.

* Among other updates the documentation now gives more info about
device capabilities on both the overview page as well as in the
drivers section.