LsSeq's pretty-printing doesn't follow height-truncation rules

[lihaoyi]

This is probably because we're pushing the truncation logic deep into each pprinter, rather than just having it performed by the final printing of the resultantIterator[String], allowing individual pprinters to misbehave

haoyi-cache@ Seq.fill(100)(100)
res5: Seq[Int] = List(
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
  100,
...
haoyi-cache@ ls!
res6: LsSeq =
'aopalliance
'asm
"com.chuusai"
"com.github.scopt"
"com.google"
"com.google.guava"
"com.google.inject"
"com.jcraft"
"com.jsuereth"
"com.lihaoyi"
"com.scalatags"
"com.thoughtworks.paranamer"
"com.typesafe"
"com.typesafe.akka"
"commons-codec"
"commons-io"
"commons-logging"
"io.spray"
"javax.annotation"
"javax.enterprise"
"javax.inject"
'jline
"net.databinder"
"org.apache"
"org.apache.ant"
"org.apache.commons"
"org.apache.httpcomponents"
"org.apache.ivy"
"org.apache.maven"
"org.apache.sshd"
"org.bouncycastle"
"org.codehaus"
"org.codehaus.plexus"
"org.eclipse.aether"
"org.eclipse.sisu"
"org.fusesource.jansi"
"org.jboss"
"org.jboss.interceptor"
"org.jboss.weld"
"org.json4s"
"org.reactivestreams"
"org.scala-lang"
"org.scala-lang.modules"
"org.scala-sbt"
"org.scala-sbt.ivy"
"org.scala-tools.sbinary"
"org.scalacheck"
"org.scalactic"
"org.scalamacros"
"org.scalatest"
"org.slf4j"
"org.sonatype.forge"
"org.sonatype.oss"
"org.sonatype.plexus"
"org.sonatype.sisu"
"org.sonatype.sisu.inject"
"org.sonatype.spice"
"org.spire-math"
"org.tukaani"
"org.vafer"
"org.webjars"
"resolved-com.lihaoyi-ammonite-shell_2.10-caller-working.properties"
"resolved-com.lihaoyi-ammonite-shell_2.10-caller-working.xml"
"resolved-com.lihaoyi-ammonite-shell_2.11-caller-working.properties"
"resolved-com.lihaoyi-ammonite-shell_2.11-caller-working.xml"
"scala_2.10"

haoyi-cache@

[lihaoyi]

Fixed by cc21a26