codegen: Changed to cope with the removal of SequenceBuilder from ceylon.language
Changes to the recovery test now that Sequencebuilder has been removed from ceylon.language.
Fix the SegmentOpIterationOptimizationCorrect test for the removal of SequenceBuilder.
Bulk update tests for change in package of SequenceBuilder.
Remove the test for issue #640, since now that the language module lacks SequnceBuilder, it's not really testing anything any more.
Rewrite some tests which depended on SequenceBuilder
Merge remote-tracking branch 'origin/sans-SequenceBuilder' into master

Conflicts:
	test/src/com/redhat/ceylon/compiler/java/test/issues/bug07xx/Bug708.src