added state_push and state_pop to PipelineOF so that Output functions in a pipeline can save and restore their state if they have a state_push and state_pop function
added state_push and state_pop to PipelineOF so that Output functions in a pipeline can save and restore their state if they have a state_push and state_pop function

ioam/svn-history,ioam/svn-history,ioam/svn-history,ioam/svn-history,ioam/svn-history