Fix, update and improve coverage of MapIteratorPrototype

Formalize tests for built-in Promise methods 

Implement `raw` flag

Add tests for Map

Uniformly and exhaustively test the generic aspects of the static- and
instance Promise methods, including:

- function `length` properties
- function `name` properties
- method property descriptors

Some tests involving the directive prologue are invalidated by source
text transformations that insert executable code in the beginning of the
script. Implement a `raw` flag that allows these tests to opt-out of
this transformation. Update the relevant tests to use this flag (and
remove references to globals only available when code is injected).

Update the Python runner accordingly:

- Do not run tests marked as "raw" in strict mode
- Reject invalid test configurations

Update the browser runner accordingly:

- Do not modify the script body of tests marked as "raw"

Improve tests for templates

Unify indentation in test_monkeyYaml.py

ES6 specific functions should declare a feature.

Use "monkeyYaml" in all environments

monkeyYaml: Add support for line folding

The String.endsWith and String.includes tests didn't specify either an es6id or a features. Added a features attribute for these tests.

The "monkeyYaml" parser is intended to serve as a lightweight fallback
to Python's standard YAML parser in contexts where the latter is not
available. Any intentionally-simplified implementation will necessarily
exhibit non-standard behavior for different input, so not all input
accepted by the standard parser will be accepted by "monkeyYaml". If
loaded exclusively in fallback situations, these edge cases can only be
identified (and debugged) in the environments that require the fallback.
This has allowed developers to unknowingly author tests that cause
errors.

Update the test runner to use "monkeyYaml" in all cases, ensuring more
consistent behavior across contexts and precluding this class of
regression.

Fixes #345

Fixed invalid configuration block delimiters.

Make tests more strict

In ECMAScript 5, assignment to a non-reference value throws a runtime
ReferenceError. ECMAscript 6 specifies an early ReferenceError in these
cases. Tests for this behavior have been authored to pass in both cases.
Simplify these tests to describe and assert the early error.

Two tests started the configuration block with a /*-- instead of a /*---.

Complete migration of website assets

Update the URLs used by dynamic script loading code according to the new
location of the recently-moved web site scripts.

Remove unnecessary "include" file