Parallel ANT

Repository:

darcs get --partial http://trelony.cjb.net/pant.2005

Changes:

• Added options:

  -single               single check executor
  -only                 execute targets without dependencies
  -j, -jobs <threads>   experimental parallel executor
  -sooner target_list   execute mentioned targets as soon as possible
  

• For parallel executor added "advanced" DependencyTracker. Target.dependsOn() now uses dependency tracker, so it does not execute topoSort() every time.
• Refactored executors - removed KeepGoingExecutor, but all other executors now learned that mode.
• Added:
  <property name="nnn">multi
  line
  text</property>

TODO:

• Add mutexes (they are needed mostly in testing, some tests cannot be executed simultaneously) via target attribute or a new meta info facility.