* By default, execute() checks the return code of the process against 0.
  This can be changed using setReturnCode() and setIgnoreReturnCode().

* Default working directory is now the project's base directory.

* Tidied up tasks to reflect the new defaults.

AbstractTask:

* Made getBaseDirectory() and getService() protected.

Logging:

* Extracted AbstractLogger out of BasicLogger, and changed RoutingLogger to
  extend AbstractLogger, rather than BasicLogger.

* RoutingLogger now uses a wrapped Logger to determine which message types
  are enabled, so that it respects the logging level set on the command-line.
  Kinda hacky, but better than writing out all the debug messages.

* Changed LoggingExecOutputHandler to use warn log level, rather than info.
  Again, a hacky fix to get logging of external command output happening when
  not running in verbose mode.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271890 13f79535-47bb-0310-9956-ffa450edef68