Print out more useful info in ant.

Decided to stop guessing at what ant was doing.

  % ant -Dscalac.args="-Xcheckinit" init
  init:
       [echo]        build time: 9 December 2011, 21:47:22
       [echo]      java version: Java HotSpot(TM) 64-Bit Server VM 1.6.0_29
       [echo]         java args: -Xms1536M -Xmx1536M -Xss1M -XX:MaxPermSize=192M -XX:+UseParallelGC
       [echo]        javac args:
       [echo]       scalac args: -Xcheckinit
       [echo]      build number: 2.10.0.dev-1340-ga890d60

Author: paulp

build.xml

@@ -189,9 +189,6 @@ PROPERTIES
   <!-- if ANT_OPTS is already set by the environment, it will be unaltered,
        but if it is unset it will take this default value. -->
   <property name="env.ANT_OPTS" value="-Xms1536M -Xmx1536M -Xss1M -XX:MaxPermSize=192M -XX:+UseParallelGC" />
-  
-  <!--  to find max heap usage: -Xaprof ; currently at 980M for locker.comp -->
-  <echo message="Forking with JVM opts: ${env.ANT_OPTS} ${jvm.opts}" />
 
   <property
       name="scalacfork.jvmargs"
@@ -246,8 +243,12 @@ INITIALISATION
       value="${version.major}.${version.minor}.${version.patch}.${git.describe}"/>
 
     <!-- And print-out what we are building -->
-    <echo level="info" message="Build number is '${version.number}'"/>
-    <echo level="info" message="Built ${time.human} from revision ${git.describe} with ${java.vm.name} ${java.version}"/>
+    <echo message="       build time: ${time.human}" />
+    <echo message="     java version: ${java.vm.name} ${java.version}" />
+    <echo message="        java args: ${env.ANT_OPTS} ${jvm.opts}" />
+    <echo message="       javac args: ${javac.args}" />
+    <echo message="      scalac args: ${scalac.args}" />
+    <echo message="     build number: ${version.number}" />
 
     <!-- Local libs (developer use.) -->
     <mkdir dir="${lib-extra.dir}"/>