split existing optimization levels into granular options

BPO 33501
Nosy @brettcannon, @ncoghlan, @vstinner, @carljm, @stevendaprano, @ambv, @ericsnowcurrently, @serhiy-storchaka

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 = None
created_at = <Date 2018-05-14.16:18:37.204>
labels = ['type-feature']
title = 'split existing optimization levels into granular options'
updated_at = <Date 2018-05-19.00:36:17.649>
user = 'https://github.com/carljm'

bugs.python.org fields:

activity = <Date 2018-05-19.00:36:17.649>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2018-05-14.16:18:37.204>
creator = 'carljm'
dependencies = []
files = []
hgrepos = []
issue_num = 33501
keywords = []
message_count = 6.0
messages = ['316531', '316544', '316905', '316908', '316926', '317080']
nosy_count = 8.0
nosy_names = ['brett.cannon', 'ncoghlan', 'vstinner', 'carljm', 'steven.daprano', 'lukasz.langa', 'eric.snow', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33501'
versions = []