Add a setstdin opcode

[flh]

Parrot currently has setstdout and setstderr opcodes, but no setstdin. This patch adds this opcode.

The documentation used to refer to the old ParrotIO PMC instead of FileHandle: this patch also contains the renaming.

[flh]

Add a setstdin opcode + docs update

[coke]

+1

[NotFound]

Parrot currently has setstdout and setstderr opcodes, but no setstdin. This patch adds this opcode.

I propose to deprecate setstdout, setstderr, getstdin, getstdout and getstderr instead of adding this one. We have the stdhandle method in the ParrotInterpreter PMC that does all this tasks, and they are not so critical in speed nor so frequently used to justify the need for opcodes.

[flh]

Agree with deprecating these ops: I did not know the stdhandle method.

I'm attaching a new patch, which only does the doc update (renaming ParrotIO to FileHandle, in sections about these ops).

[flh]

Change ParrotIO to FileHandle

[NotFound]

Tanks, applied in r39053

[flh]

Left by mistake the doc for "setstdin": patch removes it, me--

[NotFound]

Decision at today parrotsketch has been to implement the setstdin opcode and keep the others.

[NotFound]

Patch implementing setstdin applied with cosmetic changes in r39224.

I left only 'PMC' in the pod of the set opcodes. Is what the code really does, after all.

Closing ticket.