Python initialization: remove _PyMainInterpreterConfig

[vstinner]

BPO	36444
Nosy	@vstinner
PRs	bpo-36444: Remove _PyMainInterpreterConfig #12571 bpo-36444: Add _PyCoreConfig._init_main #12572 bpo-36444: Rework _Py_InitializeFromConfig() API #12576

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-03-27.15:07:38.576>
created_at = <Date 2019-03-26.23:53:00.234>
labels = ['interpreter-core', '3.8']
title = 'Python initialization: remove _PyMainInterpreterConfig'
updated_at = <Date 2019-03-27.15:07:38.576>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-03-27.15:07:38.576>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-27.15:07:38.576>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2019-03-26.23:53:00.234>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 36444
keywords = ['patch']
message_count = 4.0
messages = ['338924', '338929', '338930', '338956']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['12571', '12572', '12576']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36444'
versions = ['Python 3.8']

[vstinner]

The _PyMainInterpreterConfig structure is redundant with _PyCoreConfig: it is a subset but using PyObject*. PyInterpreterState has 2 fields:

_PyCoreConfig core_config;
_PyMainInterpreterConfig config;

config parameters can be found in core_config, but using a different type: it introduces redundancy and a risk of inconsitency (if one is modified, but not the other).

_PyMainInterpreterConfig doesn't provide any feature which is not accessible using _PyCoreConfig.

[vstinner]

New changeset 8b9dbc0 by Victor Stinner in branch 'master':
bpo-36444: Remove _PyMainInterpreterConfig (GH-12571)
8b9dbc0

[vstinner]

New changeset 484f20d by Victor Stinner in branch 'master':
bpo-36444: Add _PyCoreConfig._init_main (GH-12572)
484f20d

[vstinner]

New changeset 5ac27a5 by Victor Stinner in branch 'master':
bpo-36444: Rework _Py_InitializeFromConfig() API (GH-12576)
5ac27a5