CleanupReporter() now ignores
/dev/urandom, some packages (curl, openssl, etc.) keep this file open.
Fix compilation with ICC (#39).
Fix a crash on Linux (#47).
ps_num_fds() returns the number of open files/handles.
ps_open_files() lists all open files of a process.
ps_interrupt() interrupts a process. It sends a
SIGINT signal on POSIX systems, and it can send CTRL+C or CTRL+BREAK events on Windows.
ps_users() lists users connected to the system.
CleanupReporter, to be used with testthat: it checks for leftover child processes and open files in