cosmetic: Switch to consistent four-spaces indent; run autopep8

We had a mixture of tab and 4space based indenting, which is a bad
idea.  4space is the standard in python, so convert all our code to
that.  The result unfortuantely still shoed even more inconsistencies,
so I've decided to run autopep8 on the entire code base.

Change-Id: I4a4b1b444a2f43fab05fc5d2c8a7dd6ddecb5f07
---
M pySim-prog.py
M pySim-read.py
M pySim-shell.py
M pySim/__init__.py
M pySim/ara_m.py
M pySim/card_handler.py
M pySim/card_key_provider.py
M pySim/cards.py
M pySim/cat.py
M pySim/commands.py
M pySim/construct.py
M pySim/exceptions.py
M pySim/filesystem.py
M pySim/gsm_r.py
M pySim/iso7816_4.py
M pySim/jsonpath.py
M pySim/profile.py
M pySim/sysmocom_sja2.py
M pySim/tlv.py
M pySim/transport/__init__.py
M pySim/transport/calypso.py
M pySim/transport/modem_atcmd.py
M pySim/transport/pcsc.py
M pySim/transport/serial.py
M pySim/ts_102_221.py
M pySim/ts_31_102.py
M pySim/ts_31_103.py
M pySim/ts_51_011.py
M pySim/utils.py
29 files changed, 7,420 insertions(+), 6,468 deletions(-)