Added tests for --no-append-metadata

- Command line tests
- Documented the standard json
- Changelog
- A Change in SolidityExecutionFramework to prevent flaky gas tests
- A boost test for --no-append-metadata
- Removed an outdated comment

docs/metadata.rst

@@ -220,6 +220,10 @@ Whereas release builds of solc use a 3 byte encoding of the version as shown
 above (one byte each for major, minor and patch version number), prerelease builds
 will instead use a complete version string including commit hash and build date.
 
+The commandline flag ``--no-cbor-metadata`` can be used to skip metadata
+from getting appended at the end of the deployed bytecode. Equivalently, the
+boolean field ``settings.metadata.appendCBOR`` in Standard JSON input can be set to false.
+
 .. note::
   The CBOR mapping can also contain other keys, so it is better to fully
   decode the data instead of relying on it starting with ``0xa264``.

docs/using-the-compiler.rst

@@ -323,6 +323,9 @@ Input Description
         },
         // Metadata settings (optional)
         "metadata": {
+          // The CBOR metadata is appended at the end of the bytecode by default.
+          // Setting this to false omits the metadata from the runtime and deploy time code.
+          "appendCBOR": true,
           // Use only literal content and not URLs (false by default)
           "useLiteralContent": true,
           // Use the given hash method for the metadata hash that is appended to the bytecode.