Fix bug introduced in the flake8 cleanup (!38139).

Fixes ATLASSIM-4966, ATLASSIM-4967.

 - xrange -> range
 - has_key

Defer imports that may load shared libraries until after job configuration
is complete.  Otherwise, we may get mysterious failures of the plugin loader.



Former-commit-id: 3dc4d8ca3e9c3415782e81130ce6aa1b5c07b287

This reverts commit cdf718bf [formerly 9d67f5b8].


Former-commit-id: 008b62d0

This reverts commit 9156e32a [formerly f73d17d3], reversing
changes made to 27d106d1 [formerly 8f2f5188].


Former-commit-id: 9d67f5b8

Delete all CMT requirements files and other obsolete content in the cmt/
directories. Some non-trivial content of unknown usage has been kept.


Former-commit-id: 972e8215

'Add an InvSampler, and an example JO for flat field curvature and beamline IP sampling. Plus some more general code tweaks.' (ParticleGun-02-01-00)

	* Tagging: ParticleGun-02-01-00

	* Add an example JO showing how to use the inverse sampler to
	sample flat in B-field curvature and how to couple together
	momentum and position sampling to give an impact parameter
	distribution.

2016-04-05  Andy Buckley  <andy.buckley@cern.ch>

	* Explicitly force more sampler constructor args to float type.

	* Add InverseSampler, for e.g. B-field curvature ~ 1/pT.

	* Tagging: ParticleGun-02-00-07

	* Try harder to distinguish between single and disjoint uniform sampling interval shorthand sequences.

	* Fix accidental tuple expansion in DisjointRandomSequence expansion.

	* Adding randomSeed property setting to examples (ParticleGun RNG stream not configured for vanilla Athena).

'Re-fix mass setting ;-) Previous version is mostly right but could produce out-of-sync vector and gen masses.' (ParticleGun-02-00-06)

	* Tagging: ParticleGun-02-00-06

	* Re-fix mass setting ;-) Previous version is mostly right but could produce out-of-sync vector and gen masses.

2015-01-29  Ewelina Lobodzinska  <ewelina@mail.desy.de>

        * Tagging: ParticleGun-02-00-05

        * implement fix provided by Zach for mass setting

2015-01-28  Andy Buckley  <andy.buckley@cern.ch>

	* Tagging: ParticleGun-02-00-04

	* Improve generated_mass setting and remove accidental print.

2015-01-25  Andy Buckley  <andy.buckley@cern.ch>

	* Tagging: ParticleGun-02-00-03
...
(Long ChangeLog diff - truncated)