Add "Package class >> load" and supporting methods
Make sure Helios error handler is registered
- register DebugErrorHandler only if no other handler is registered
- same for RethrowErrorHandler
Removes TagBrush and HTMLCanvas >> isMSIE
Makes JSObjectProxy a subclass of AbstractProxy
Remove empty protocols when recompiling a method, fixing issue #691
Simpler fix for previous commit
Removes old HTMLCanvas class >> is*
Revert "Simpler fix for previous commit"
It has issue because of the removal of the compiledMethod

This reverts commit 04637ce678ce3fc3c2363e97a167fec65c1130c6.
using amber_helios/html to locate helios.html

amber_html was strange namespace anyway
Merge pull request #764 from herby/amber-helios-html

using amber_helios/html to locate helios.html
Merge branch 'upstream' into pr-728
Fixed *extension category

Importer-Exporter was renamed to Kernel-ImportExport
Fixes #763
added Package >> loadFromNamespace:

... and Package class >> load:fromNamespace:
update API-CHANGES.txt
Update API-CHANGES.txt
Update CHANGELOG
Merge branch 'upstream' into ext-728

Conflicts:
	API-CHANGES.txt
SequenceableCollection >> numericallyIndexable
numericallyIndexable used; String use inherited