Beta7

Added new open source pthread library (and removed the old one)
Fixed ncurses/termios problem
Fixed non-blocking stdin when used with socket and poll
Changed DOS library requirements to v52 instead of v54
Added misc folder to SDK installation and package that contain terminfo entries
Fixed a bug in spawnv function was causing a bad exe filename and a memory leak.
Added flock function. Fixed a problem on record_locking was not allocating memory correctly
Added stdio_ext functions (except __freadptr)
More bug fixes and improvements