Remove _VERSION from strcore.

_[A-Z] is reserved for Lua.  I have to remember that.
Rename _POLL to POLL.

_[A-Z] is reserved for Lua.  Sigh.
Rename _STDIN, _STDOUT and _STDERR to STDIN, STDOUT, STDERR

_[A-Z] is reserved for Lua.  Section 2.1 of 5.1 manual; section 3.1 of Lua
5.2 manual.
Fix lexical violation in the code.

_[A-Z]* is reserved for Lua.
Fix language violation.

_[A-Z]* is reserved for Lua.