Add support for the Voltcraft M-4650CR.
Add support for the Metex M-4650CR.

(the Voltcraft M-4650CR is a rebadged Metex M-4650CR)
metex14: Handle a few missing cases for overflow.
rigol-ds1xx2: detect Rigol DS1xx2 with upgraded bandwith

The bandwith in Rigol DS1xx2D/E scopes can be upgraded to 150 MHz in software.
So detect also scopes with the upgraded bandwith.

using libsigrok-0.2.1 + this change + commit da970d24ec (required for newer kernels):

[dan@eagle sigrok]$ sigrok-cli --scan -d rigol-ds1xx2 -l 5
sr: libsigrok loglevel set to 5.
sr: Sanity-checking all drivers.
sr: Sanity-checking all input modules.
sr: Sanity-checking all output modules.
srd: libsigrokdecode loglevel set to 5.
sr: hwdriver: Initializing driver 'rigol-ds1xx2'.
sr: serial: Opening serial port '/dev/usbtmc0' (flags 1).
sr: serial: Opened serial port '/dev/usbtmc0' (fd 7).
sr: serial: Wrote 5/5 bytes (fd 7).
sr: serial: Closing serial port /dev/usbtmc0 (fd 7).
sr: rigol-ds1xx2: response: /dev/usbtmc0 [Rigol Technologies,DS1152D,DS1EU150XXXXXX,00.04.01.00.02]
sr: hwdriver: Scan of 'rigol-ds1xx2' found 1 devices.
The following devices were found:
rigol-ds1xx2 - Rigol Technologies DS1152D 00.04.01.00.02 with 18 probes: CH1 CH2 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
HACKING: Updates, some additions.
doxygen: @since tags document only last API change.

If a function existed before but the API changed, the @since
tag only reflects the release of the last API change.
README.devices: Updates.
README.devices: uni-t-dmm devices need VID/PID now.
configure.ac: Move a teleinfo snippet to the correct place.

This breaks some configure use-cases otherwise.
configure.ac: Fix list sorting (cosmetic).
contrib/z60_libsigrok.rules: Add entry for the Saleae Logic16.
contrib/z60_libsigrok.rules: Also mention UNI-T UT325.

The same USB/HID based IC is used in the UNI-T UT-D04 cable (for various
multimeters) and the UNI-T UT325 thermometer.
output/analog: SR_UNIT_REVOLUTIONS_PER_MINUTE: Add missing break.
NEWS: Update for upcoming 0.2.2 release.
configure.ac: Bump package version to 0.2.2.
configure.ac: Bump libtool/library version from 1:1:0 to 1:2:0.

The libtool current:revision:age numbers change from 1:1:0 to 1:2:0
(i.e., revision is increased) since the library source code has changed,
but no interfaces were added or changed or removed.

Details:
http://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info

This changes the library filename (e.g. on Linux) from libsigrok.so.1.0.1
to libsigrok.so.1.0.2, but the SONAME (+symlink) remains the same
(libsigrok.so.1) since this release is API- and ABI-compatible with the last.
update udev rules

With usbtmc driver being classified under usbmisc in newer kernels the udev rules
need an update.
probe_groups: API changes required to implement probe groups.
Use priv for consistency
probe_groups: Update Python bindings for API change.