also use constant field instead of hardcoded literal in tests

* add assertion
* fix tests
* #KT-1748 Fixed

This reverts commit 59c7f33c.

This reverts commit 18170a0b.

Conflicts:
	compiler/backend/src/org/jetbrains/jet/codegen/GenerationState.java
	compiler/cli/src/org/jetbrains/jet/compiler/CompileSession.java
	compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/AnalyzerFacadeForJVM.java
	compiler/tests/org/jetbrains/jet/codegen/GenerationUtils.java
	compiler/tests/org/jetbrains/jet/resolve/ExpectedResolveData.java
	compiler/tests/org/jetbrains/jet/types/JetDefaultModalityModifiersTest.java
	idea/src/org/jetbrains/jet/plugin/libraries/JetSourceNavigationHelper.java
	idea/src/org/jetbrains/jet/plugin/parameterInfo/JetFunctionParameterInfoHandler.java
	idea/src/org/jetbrains/jet/plugin/project/WholeProjectAnalyzerFacade.java
	idea/src/org/jetbrains/jet/plugin/quickfix/ChangeVariableMutabilityFix.java
	idea/src/org/jetbrains/jet/plugin/quickfix/ImportInsertHelper.java
	idea/src/org/jetbrains/jet/plugin/quickfix/QuickFixUtil.java
	idea/src/org/jetbrains/jet/plugin/refactoring/JetNameSuggester.java
	idea/src/org/jetbrains/jet/plugin/refactoring/JetRefactoringUtil.java
	idea/src/org/jetbrains/jet/plugin/refactoring/introduceVariable/JetIntroduceVariableHandler.java

KT-1237 Auto-completion of "return" keyword should not insert space after it when in a method returning Unit

 #KT-1237 fixed
 #KT-1238 fixed

Holds reference to runtime.jar and jdk-headers.jar. Paths to these
jars are no longer hardcoded.

Many tests now compile runtime before execution. Because of this:
* Single test invocation is significantly slower now for some tests
* This can be fixed by making tests independent from runtime (this
must be done anyway)

Some tests still depend on runtime.jar built by "ant dist", this
is to be fixed.

(will be used later)

 #KT-1137 fixed