Make several significant changes to the OpenDS code base, including:

- Narrow down the set of packages that external developers will need to access
  in order to write a plugin or other type of extension.  Hopefully, for most
  things developers will only need to interact with the following packages (and
  their sub-packages):
  * org.opends.server.admin
  * org.opends.server.api
  * org.opends.server.config
  * org.opends.server.protocols.internal
  * org.opends.server.types
  * org.opends.server.util

- As part of the attempted narrowing of packages that external developers need
  to access, I have moved the org.opends.server.core.Operation and
  org.opends.server.protocols.ldap.LDAPException classes to the
  org.opends.server.types package.  I have also created
  org.opends.server.types.RawAttribute to wrap the
  org.opends.server.protocols.ldap.LDAPAttribute class, and
  org.opends.server.types.RawModification to wrap the
  org.opends.server.protocols.ldap.LDAPModification class.

- I have updated the internal operations API to add a few new convenience
  methods when performing internal operations.

- I have updated all of our message strings so that none of them end in periods
  (except those that end with an ellipsis).  This will help us avoid the
  problem in which we see multiple periods due to embedding one message in
  another.

- I have moved a message file from a synchronizaiton package to the messages
  package and resolved conflicts with existing message IDs.

- I have updated a number of cases in which
  StaticUtils.stackTraceToSingleLineString() was used in client-facing code to
  replace those calls with StaticUtils.getExceptionMessage() instead.  This
  should provide a more user-friendly message that will hopefully not reduce
  our ability to debug problems that may arise.

- I have cleaned up some of the code in the org.opends.server.api package so
  that all of the classes use consistent formatting, and to fix a couple of
  potential Javadoc problems.

- I have moved the build-tools/src directory to src/build-tools to be more
  consistent with other components of the server.

- I have updated the build script so that the xslt task will no longer dump
  lots of output to the terminal when generating code.  I have also gotten rid
  of warnings about run.classpath not being set properly.