Conflicts:
	cli/pom.xml
	core/pom.xml
	test/pom.xml
	war/pom.xml

not using the deprecated GroovyHudsonTestCase anymore

convert tests from JUnit3 to JUnit4

Fix typoo.

* just the two updated classes were affected

document-properties imgs get transparent background

Other 24x24 images have this, changed document-properties.png and .gif to
match.

* life goes on :-)
* touching all tests that directly inherit from junit.framework.TestCase

cleanup - make pom.xml files more consistent

fix Javadoc

This helps with the situation where multiple Jenkins instances exist in memory (at the same time or at different times sequentially), such as during unit tests.

RunIdMigrator.LEGACY_ID_FORMATTER was static, which gets instantiated before the time zone is overriden during the test. Changing this to an instance field so that it gets created later on.

[FIXED JENKINS-25897] Add range check for H(X-Y) syntax

- Recorded the fix in changelog.
- Added a separate screen to show the unmigration instruction, which
  makes it easier for people to find it than search logs.