Evaluate removal of TPTP from JBT 3.3

TPTP is being archived after their 4.7.2 release in Helios SR2 [1]. Therefore, we need to either continue to build our TPTP stuff on top of the Helios version of TPTP and patch it if necessary so it'll work in Eclipse 3.7 (JBT 3.3), or remove it entirely & drop support.

[1] http://www.eclipse.org/tptp/home/project_info/devplans/EclipseTPTPProjectPlan2010.htm

Currently, the feature groups we use from Eclipse TPTP 4.7 are:

<unit id="org.eclipse.tptp.platform.profile.server.feature.group" version="4.5.1.v201009092123-7H7F3AkF7B79N8WCTEH"/>
<unit id="org.eclipse.tptp.platform.instrumentation.ui.feature.group" version="4.3.2.v201101261720-797918s735435695C83"/>
<unit id="org.eclipse.tptp.platform.core.feature.group" version="4.7.2.v201101261720-8X8ZFXoFLWUl6wn5veAISx"/>
<unit id="org.eclipse.tptp.platform.jvmti.feature.group" version="4.5.1.v201009092123-797A38s7354466855B7"/>
<unit id="org.eclipse.tptp.platform.trace.feature.group" version="4.5.2.v201101261720-7L7O8fBgJ9EC9NDREaF9"/>
<unit id="org.eclipse.tptp.platform.xerces.feature.group" version="4.6.0.v201005032111-777K4AkF7B77R7c7N77"/>
<unit id="org.eclipse.tptp.platform.instrumentation.ui.feature.group" version="4.3.2.v201101261720-797918s735435695C83"/>
<unit id="org.eclipse.tptp.platform.probekit.feature.group" version="4.5.2.v201101271120-7H7BF8QAkF7B87RBVCFFD"/>
<unit id="org.eclipse.tptp.platform.commons.logging.feature.group" version="4.5.0.v201005032111-2-37w312116191612"/>
<unit id="org.eclipse.tptp.platform.jakarta.log4j.feature.group" version="4.5.0.v201005032111-217E7w312116191611"/>
<repository location="http://download.eclipse.org/tptp/updates/helios/"/>