Merging python changes since Jan 22

ipaacalib/java/src/ipaaca/AbstractIU.java

ipaacalib/java/src/ipaaca/IUConverter.java

ipaacalib/java/src/ipaaca/LocalIU.java

ipaacalib/java/src/ipaaca/Payload.java

ipaacalib/java/src/ipaaca/RemotePushIU.java

ipaacalib/python/src/ipaaca/__init__.py

ipaacalib/python/src/ipaaca/buffer.py

ipaacalib/python/src/ipaaca/converter.py

ipaacalib/python/src/ipaaca/defaults.py

ipaacalib/python/src/ipaaca/iu.py

ipaacalib/python/src/ipaaca/misc.py

ipaacatools/scripts/ipaaca-iu-injector

ipaacatools/scripts/ipaaca-iu-sniffer