better scala container addition tagging
Basic status handler for the Xsource flag
Switch ScalaPresentationCompilerProxy.failedCompilerInitialization to Status Handlers
Centralizing thread Management for handlers
Aggregate Initialization Failures in ScalaCompiler reference validation
Switch UIErrorReporter to status handlers
TIghter threading behavior for Handlers

They are now syncExec, and all but one synchronize on an exterior variable.
Indeed, event queues make them fire often :
- CompilerLaunchError : obviously
- ClasspathError : the Xsource modification triggers a classpath Check through the listener added to projectSpecificSetting.

TODO : instead of this, In ScalaProject's projectSpecificStorage, fire a java model Delta
	that can be caught by ScalaPlugin's elementchanged.
Removes split pre-compiled compiler interface

Only base version version is packaged (and not used at runtime). The source bundle is used at runtime.
Merge pull request #699 from skyluc/issue/no-need-specific-compiler-interface

Removes split pre-compiled compiler interface
More informative logging about resetting compilers.

Slightly changed the deprecation warning test, trying to work around possible
race condition.
Merge pull request #700 from dragos/issue/flaky-deprecation-warning-test

More informative logging about resetting compilers.
Bumps to Scala 2.11.2-SNAPSHOT
Merge pull request #702 from skyluc/issue/scala-2.11.2

Bumps to Scala 2.11.2-SNAPSHOT
Makes sure to install the sbt compiler interface sources
Adds the sbt full library source feature to the update site
Merge pull request #703 from skyluc/issue/force-install-sbt-sources

Makes sure to install the sbt compiler interface sources
"Desired source level" toggle

- creation
- modification of the Xsource flag on modification

- classpath error status handler monothreaded again

- Toggle sourceLevel in case of manual-only Xsource edition

- Grey out souceLevel if no useProjectSettings

- Prevent double dialog on close/clean project
Merge pull request #696 from huitseeker/topic/ScalaDesiredVersion

Scala Source Level + Xsource UI support and validation