Remove call to obsolete enable_tree_speedups().

Delete the `gen/load_typeregistry_dso` functions that could create/load a
`typereg_dso_db.csv` file with type information. However, the generate
function currently just creates an empty file and thus this code seems
no longer necessary.

Remove support for pre-MT thinning (ThinningSvc).

 - xrange -> range
 - take basestring from past.builtins
 - long
 - take reload from imp
 

Enable flake8 for all python modules and make them compliant.

Initial python3 port.  Not yet meant to be complete; only enough to run
basic athena/configuration jobs.

Removing uses of PyCintex, CINT, Reflex and ROOT5 from packages in
Control - they are not needed in ROOT6 world.


Former-commit-id: 61252ce5

Former-commit-id: 56a7a78c27828483a3f9d143788ae799752b3178

	* Tagging AthenaPython-00-06-40-01.
	* Merge from trunk:

	2015-11-15  scott snyder  <snyder@bnl.gov>
        * Tagging AthenaPython-00-06-45.
	* python/Bindings.py (_py_init_ClassIDSvc): Make sure dictionaries
	get loaded with root6.

	* python/Bindings.py: Protect IThinningSvc.RemovedIdx assignment
	(needed by ROOT 6).
        * Tag AthenaPython-00-06-39

2014-11-26  Karsten Koeneke  <karsten.koeneke@cern.ch>

	* python/PyAthenaComps.py: Move to new ICutFlowSvc.
        * Tag AthenaPython-00-06-38

2014-11-13 Will Buttinger <will@cern.ch>
        * src/PyAthenaAlg.cxx and PyAthenaComps.py : added resetExecuted method callthrough to python so this can be implemented in python
        * added setExecuted and isExecuted accessors to underlying cpp handle as well
        * Tag AthenaPython-00-06-37

2014-11-10  Marcin Nowak  <Marcin.Nowak@cern.ch>
	* python\FilePeekerLib.py(process_metadata): enabled
	coral::Attribute::data<bool> reading for ROOT6 after fix: https://sft.its.cern.ch/jira/browse/ROOT-6067
        * Tag AthenaPython-00-06-36

...
(Long ChangeLog diff - truncated)