popen and pclose implementations for Linux using fork().
Configured FILE pointers on Linux to properly initialize pipeInfo structure
Merge pull request #129 from andreiw/master

Some fixes for OW built/building with gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
Added documentation for popen/pclose on Linux, although they are not included in any doc builds.
Moved popen and pclose for Linux to streamio directory.
Merge pull request #128 from ArmstrongJ/popen

Implementations of popen and pclose for Linux
cleanup gui code
change symbol name to title to be more readable