Merge branch 'devel' into IOSelector_unregister_fix

changelog.md

@@ -7,6 +7,7 @@
 
 ### Breaking changes in the standard library
 
+- `base64.encode` no longer supports `lineLen` and `newLine` use `base64.encodeMIME` instead.
 
 
 ### Breaking changes in the compiler
@@ -24,6 +25,8 @@
 
 - `asyncdispatch.drain` now properly takes into account `selector.hasPendingOperations` and only returns once all pending async operations are guaranteed to have completed.
 - `asyncdispatch.drain` now consistently uses the passed timeout value for all iterations of the event loop, and not just the first iteration. This is more consistent with the other asyncdispatch apis, and allows `asyncdispatch.drain` to be more efficient.
+- `base64.encode` and `base64.decode` was made faster by about 50%.
+- `htmlgen` adds [MathML](https://wikipedia.org/wiki/MathML) support (ISO 40314).
 
 ## Language additions
 
@@ -31,6 +34,7 @@
 
 ## Language changes
 
+- Unsigned integer operators have been fixed to allow promotion of the first operand.
 
 
 ### Tool changes