[io] Create a PipeHandle PMC representing a pipe/fifo endpoint.
[io] Create a PipeHandle PMC representing a pipe/fifo endpoint.

git-svn-id: ab052325e6ff0215049859dfe087640a330fcaf7@39265 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

gitster/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,tewk/parrot-select,tkob/parrot,FROGGS/parrot,FROGGS/parrot,FROGGS/parrot,gitster/parrot,gagern/parrot,youprofit/parrot,tewk/parrot-select,gitster/parrot,gitster/parrot,fernandobrito/parrot,fernandobrito/parrot,tewk/parrot-select,tewk/parrot-select,gitster/parrot,fernandobrito/parrot,tkob/parrot,gagern/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,gagern/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,fernandobrito/parrot,parrot/parrot,FROGGS/parrot,youprofit/parrot,fernandobrito/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,tewk/parrot-select,youprofit/parrot,gagern/parrot,fernandobrito/parrot,gitster/parrot,tkob/parrot,FROGGS/parrot,gagern/parrot,gagern/parrot,parrot/parrot,gitster/parrot,tewk/parrot-select,gagern/parrot,fernandobrito/parrot,tewk/parrot-select,parrot/parrot