Co-authored-by: Luciano Bello <luciano.bello@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* basicaer handling of global_phase.

Also, adapted some transpiler passes to preserve global phase in dag.

* catch non-float global_phase

* update state vector simulator

* linting

* blank line needed

* update Decompose pass for global phase

* update transpiler passes which create new dagcircuits.

This preserves global phase in newly created dagcircuit.

* Drop support for python 3.5 (#4926)

This commit drops support for running with python 3.5. It marks the
minimum supported version of the package as python 3.6, removes python
3.5 package pins, removes the 3.5 CI jobs, and removes the warning on
python 3.5. Looking at the PyPI stats since the deprecation period
started the number of users on Python 3.5 has diminished significantly,
but not disappeared. There were 783 downloads with pip from pypi out of
total of 25782 total pip downloads in the last 30 days. Compared to the
roughly 10% figure when we deprecated Python 3.5.

Merging this means we can not release until after the documented EoL
date for Python 3.5 support of September 13. This shouldn't be a problem
because with #4767 we will need to coordinate the release of all the
qiskit elements and are planning to do that after 09/13/2020.

It's worth noting that we should start planning to deprecate python 3.6
support sooner rather than later it goes EoL upstream at the end of
next year [1] and some of our other upstream dependencies (mainly numpy
et al) are going to remove support before the upstream Python EoL date
[2].

[1] https://devguide.python.org/#branchstatus
[2] https://numpy.org/neps/nep-0029-deprecation_policy.html

Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com>

* Explicity set encoding of release notes via reno config (#5013)

The recent reno release 3.2.0 included a new feature [1] for setting the
character encoding that reno uses for all it's files. [2] This commit
sets this option in the reno config file to make the release note files
explicitly utf8. This is important (especially for windows users)
because we have literal inlines of the text drawer in some release notes
which use utf8 characters. This should avoid issues for users who's
system encoding is not compatible with the text drawer output in the
release notes.

[1] https://opendev.org/openstack/reno/commit/984bcba17e4e0b46763f42015d09680e5c5d5a04
[2] https://docs.openstack.org/reno/latest/user/usage.html#configuring-reno

* Fix parameterized Gate.definition to have valid ParameterTable. (#4945)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* Allow ParameterExpressions to be cast to ints (#5001)

- Resolves #4978

Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com>

* Add tutorials job to CI (#4907)

* Add tutorials job to CI

This commit adds a new job to run the qiskit tutorials in CI. The
tutorials are used as a form of upgrade testing to ensure that for key
examples Qiskit as a whole is N and N+1 releases. This caused friction
during the qiskit 0.20.0 release because the tutorials were never
updated to stop using deprecated code (or in the case of other elements
by merging backwards incompatible changes). To ensure there aren't any
surprises at the last minute when we run the tutorials with a proposed
new metapackage this commit adds a job to CI to ensure that they always
run with terra changes. It means for PRs that change an api (after a
deprecation cycle) the tutorial will need to be updated first. This will
ensure that users will have an upgrade path because CI in
qiskit/qiskit-tutorials runs with the metapackage.

* Install pandoc in tutorials job

* Remove aqua tutorials from ci job for run time

* Fix rm path and speed up tutorials clone

* Try pinning matplotlib

* Try fixing archive path

* Add back aqua tutorials

Co-authored-by: Luciano Bello <luciano.bello@ibm.com>
Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com>

* Fix/5015 QuantumCircuit __eq__ should always return a Bool (#5016)

* Check if circuit is an instance of QuantumObject before comparing it
Added a few tests

* Fixed lint error

Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* fixed issue 4936 by updating the docstring (#5014)

Co-authored-by: Luciano Bello <luciano.bello@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* fix bux in optimize_1q_gates

* minor linting

* fix test

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: Andrew Meyer <andrewm1100@gmail.com>
Co-authored-by: Luciano Bello <luciano.bello@ibm.com>
Co-authored-by: Raul Otaolea <raul.otaolea@gmail.com>
Co-authored-by: Tanya Garg <62295887+tgag17@users.noreply.github.com>