Enhance ptyfs to handle multiple instances.

[Ilya Zykov <netbsd%izyk.ru@localhost>]

Hello!
I desire develop this project.

About me.
I am system administrator in little Italy-Russia's firm. I live in Moscow.
OS kernel it's my hobby mainly.
I have free time now and can do this project about 1-2 months.
I have little experience with Linux kernel's tty layer and few accepted patches.
The largest:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/tty/tty_buffer.c?id=64325a3be08d364a62ee8f84b2cf86934bc2544a

I have few questions about project.
Christos, can I ask you about this?
Please, if anybody has objections or already doing it, tell me know.

Best regards.
Ilya.