Revert "Create Toolbox's workspace in user.home/.tlaplus."

This reverts commit 85628f37.

See https://github.com/tlaplus/tlaplus/issues/8 for context.

org.lamport.tla.toolbox.product.product/org.lamport.tla.toolbox.product.product.product

@@ -34,7 +34,6 @@ openFile
       <vmArgs>-Xmx1000m
 -Dorg.eclipse.equinox.http.jetty.http.port=10996
 -Dosgi.splashPath=platform:/base/
--Dosgi.instance.area.default=@user.home/.tlaplus/
       </vmArgs>
       <vmArgsMac>-XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts
       </vmArgsMac>
@@ -57,6 +56,7 @@ openFile
       <windows include="false">org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7</windows>
    </vm>
 
+
    <plugins>
    </plugins>
 

org.lamport.tla.toolbox.product.product/src/deb/control/postinst

@@ -6,6 +6,20 @@ chmod 755 /opt/TLA+Toolbox/toolbox
 ## Update mime database for x-tla type.
 /usr/bin/update-mime-database /usr/share/mime
 
+## Place Toolbox's workspace directory
+## in her home directory to support
+## multi-user installation and not 
+## require user write access to
+## /opt/TLA+Toolbox/. Also makes 
+## replacing the Toolbox less error
+## prone when TLA+Toolbox is never 
+## touched except for dpkg.
+## Having a fixed workspace location
+## is also better than creating a 
+## workspace directory in ever directory
+## from which the Toolbox is launched.
+echo "-Dosgi.instance.area.default=@user.home/.tlaplus/" >> /opt/TLA+Toolbox/toolbox.ini
+
 #- Apt repo
 #-- Jenkins Plugin
 #-- https://github.com/theoweiss/apt-repo