Cleanup locate() and friends.

Conflicts:
	org.scala-ide.sdt.core/src/scala/tools/eclipse/LocateSymbol.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ScalaPresentationCompiler.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/sourcefileprovider/SourceFileProviderRegistry.scala
Interactive scaladoc.

Add interactive scaladoc used when showing the hover and
when presenting scala symbol in the completion popup.

Fix #1000453, Fix #1000210.

Conflicts:
	org.scala-ide.sdt.core.tests/src/scala/tools/eclipse/completion/CompletionTests.scala
	org.scala-ide.sdt.core.tests/src/scala/tools/eclipse/testsetup/TestProjectSetup.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/LocateSymbol.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ScalaHover.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ScalaPresentationCompiler.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ui/ScalaCompletionProposal.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ui/ScalaCompletionProposalComputer.scala
	pom.xml
Fixes ScaladocGlobalTrait initialization

Packages for 2.11/2.10 source directories

Adds a basic doc test
Corrects PC thread confinement

Corrects Analyzer plugin initialization

Conflicts:
	org.scala-ide.sdt.core.tests/src/scala/tools/eclipse/pc/DocumentationTest.scala
	org.scala-ide.sdt.core.tests/src/scala/tools/eclipse/pc/PresentationCompilerTest.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/LocateSymbol.scala
Fix compilation unit tracking through enclosingPackageClass

Conflicts:
	org.scala-ide.sdt.core.tests/test-workspace/pc_doc/src/varz.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/LocateSymbol.scala

Conflicts:
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ui/ScalaCompletionProposal.scala
Fix hyperlinking thread confinement
address PR review comments
relax thread containment
add packages & multi-source test cases
fix merge errors

Conflicts:
	org.scala-ide.sdt.core.tests/src/scala/tools/eclipse/completion/CompletionTests.scala
	org.scala-ide.sdt.core/src-2_11/scala/tools/eclipse/ScaladocGlobalCompatibilityTrait.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/LocateSymbol.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ScalaHover.scala
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ui/ScalaCompletionProposal.scala
Simplified parsedDocComment

Conflicts:
	org.scala-ide.sdt.core/src/scala/tools/eclipse/ui/ScalaCompletionProposal.scala
Constraining the use of getJavaElement
Makes legacy locate available again
more thread confinement, more robust linkChoice
Prevent NSDNHO in LocateSymbol, minor fixes

Should be compatible with scala/scala/pull/2775
Faster enclosing position location for wordPos
solves commment update problem on 2.11

Fixes #1000210, #1000453
other minor cosmetic fixes
finalizes eager site computation
Minor fix

absent return type of getHOverInfo breaks the play2 plugin
FIxing thread confinement in browserInput
Better fix for interactive docComment clearing in 2.11
more NSDNHO fixing in LocateSymbol
Cosmetics