env: Print mutmut results on error on Linux

parse: Don't mutate self.parse_value ...

I don't quite understand why this is happening but mutmut will replace
this effectful function with 'None' and cause the loop to loop forever.

requirements: Lock hypothesis to 6.50.1 ...

This is done because it now complains about deprecating @composite
that doesn't use draw and errors out.

env.sh: Fix typo

env: Update for mutmut 2.4.1 ...

This fixes the progress spinner bug but also requires a change to path
specification.

parse: Add newline to make printing ParseContexts easier

parse: Add statement parsing

tests: Document expected parse task

tests: Test parse_value error propagation

parse: Add code for parsing values

env: Use automatic CPU count for dotest_long ...

The memory leak seems to be fixed now

tests: parse: Clarify what error_on_token does

tests: parse: Use a mock class for note skipping

tests: Use a static parse context for tests

tests: Use a static token location for random tokens

tests: Use static tokens with static locattions

tests: Use static token location for tokenizer test

tests: Fix test reference invalid name

tests: Fix test_tokenize not testing whitespace ...

This relied on draw_token_random which now doesn't include whitespace

tests: Document parse error exception codes

parse: Reserve keywords for reference names

tests: Move whitespace code to test_tokenize ...

The parser doesn't have to worry about whitespace, so it's not worth
worrying about it here.

parse: Parse a reference node

env: Fix reference to syntax.py

tests: Add garbled strategy for draw_token_random

src: Rename syntax to token

parse: Remove SyntaxType ...

Once again I find myself in the pattern of having a useless 'type' value
that just complicates my life. In this case the correct appproach is to
output the AST directly.

parse: Parse text and bools to AST types

parse: Check types when clearing notes, add extra tests

syntax: Refactor draw_syntax_random and add draw_syntax_texttoken ...

I realized draw_syntax_classified is the same as draw_syntax_random, so
just merge them.

Also add draw_syntax_texttoken explicitly meant to weed out cases where
token type is not set.