IDLE: remove unused code in pyparse module

BPO	32905
Nosy	@terryjreedy, @miss-islington
PRs	bpo-32905: IDLE - remove unused code in pyparse module #5807 [3.7] bpo-32905: IDLE - remove unused code in pyparse module (GH-5807) #5808 [3.6] bpo-32905: IDLE - remove unused code in pyparse module (GH-5807) #5809

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2018-02-22.08:11:12.068>
created_at = <Date 2018-02-22.05:06:20.584>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7']
title = 'IDLE: remove unused code in pyparse module'
updated_at = <Date 2018-02-22.08:11:12.068>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2018-02-22.08:11:12.068>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-02-22.08:11:12.068>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-02-22.05:06:20.584>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 32905
keywords = ['patch']
message_count = 4.0
messages = ['312534', '312536', '312538', '312540']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['5807', '5808', '5809']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32905'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']