JBIDE-14015 org.jboss.tools.common.model tries (and fails) to create linked resources

Removed code creating linked resources from FileSystemImpl.
[JBIDE-13939] fix usage tests for Kepler M6
* Ensure GlobalUsageSettingsTest is restoring the usage enablement in
  the system properties after test execution.
* Dont run UsageReport within the display thread in IStartup since UsageReport
  already switches to the display thread where required
* Added tycho configuration to have this run outside the UIHarness, UIThread
* Removed catch in UsageReportDispatcher since it extends SafeRunnable
JBIDE-14009 Change palette content when HTML page is changed

Method update() is added to PaletteContents to be used by a
document listener to switch palette.
JBIDE-13995 EL suggestions box options depends on order of methods

The issue is fixed by the sorting of getters and setters and using an argument type as a property type in case
of setter is set as a first or the only one IJavaElement for the property.
The getters and setters are set to appear sorted in Content Assistatn additional info window as well as in EL Tooltips for
Java/HTML/JSP/XHTML Editors.
JUnit Test is added for the issue: org.jboss.tools.jsf.jsp.ca.test.CAELBeanPropertyTest.
Existing org.jboss.tools.jsf.jsp.hover.ELTooltipTest JUnit Test is updated as well due to test the issue.

	modified:   common/plugins/org.jboss.tools.common.el.core/src/org/jboss/tools/common/el/core/ca/AbstractELCompletionEngine.java
	modified:   common/plugins/org.jboss.tools.common.el.core/src/org/jboss/tools/common/el/core/resolver/TypeInfoCollector.java
	modified:   common/plugins/org.jboss.tools.common.el.ui/src/org/jboss/tools/common/el/ui/ca/ELProposalProcessor.java
JBIDE-13777 There is no error message in log if palette xml is broken

Error message is logged, including resource name and xml error.
Test is added.
JBIDE-14092 Updated parent pom version for Beta1 (jbosstools-base)
JBIDE-14095 Full path to the opened file instead of a workspace related path

XModelObjectEditorInput.getToolTipText() is modified
to return for a file the same result as FileEditorInput.