python: use setuptools and put bindings into sigrok.core.lowlevel.
python: Adding callback can fail, and refcount must be incremented.
python: Release GIL during libsigrok calls.
swig: Wrap additional GVariant operations.
python: Add high level API.
python: Fix syntax to support Python 3.x.
python: fix cdata to work with Python 3.x.
python: Add missing license headers.
fx2lafw: Support config_get(SR_CONF_CONN)

This generates a bus.address conn string which can be used to
uniquely identify the given sr_dev_inst.
hantek-dso: Support config_get(SR_CONF_CONN)
python: Add Analog class.
python: Add further properties to Analog class.
fx2lafw: Consistently return SR_ERR_ARG if sdi is needed
hantek-dso: Consistently return SR_ERR_ARG if sdi is needed
lascar-el-usb: Support SR_CONF_CONN
victor-dmm: Support SR_CONF_CONN
python: config_get() now returns SR_ERR_NA.
python: Add a Log class to control libsigrok logging.
python: Add classes for values of API enums.
python: Use --cflags-only-I to get includes in setup.py.