java.util.ConcurrentModificationException in some places

[phinfinity]

There are some places where we iterate and modify collections concurrently, make a survey of entire library and remove these:

e.g StackTrace:

E/AndroidRuntime( 9519): FATAL EXCEPTION: main
E/AndroidRuntime( 9519): java.util.ConcurrentModificationException
E/AndroidRuntime( 9519): at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
E/AndroidRuntime( 9519): at java.util.HashMap$KeyIterator.next(HashMap.java:833)
E/AndroidRuntime( 9519): at com.phinvader.libjdcpp.DCClient.get_nick_list(DCClient.java:267)
E/AndroidRuntime( 9519): at com.phinmadvader.andcpp.DCPPService.get_nick_list(DCPPService.java:402)