Error handling for malloc() -- issue kevinlawler#270

fix kevinlawler#365: K2's time command does not return a value

fix issue 371 for Windows

add test to check for leaks on issue 307

cosmetics

segregate fork()-dependent code away from WIN32

fix kevinlawler#347: -h http_port not implemented in Windows

fix kevinlawler#346: http-GET-request not implemented in Windows

fix kevinlawler#352: Odd issues with >: and <: and error mode

fix kevinlawler#344: read from stdin not implemented in Windows