PStreams 0.8.0 released

Version 0.8.0 of Pstreams is available now, with new features and performance optimisations.

Release notes for PStreams 0.8.0

The child process will now switch to a new process group, with the
process group ID the same as the PID. The basic_pstreambuf::killpg()
member function has been added to send a signal to the child's process
group.

New constructors to simplify the common case where the string specifying
the file to be executed is the same as the first element of the argv_type
vector.

Fixes for compatibility with Clang++ and _FORTIFY_SOURCE.