osproc: fix naming inconsistiences
Merge branch 'devel' of https://github.com/Araq/Nimrod into devel
Merge branch 'devel' of https://github.com/Araq/Nimrod into devel
osproc: use clone with CLONE_VM on Linux for faster process spawning
osproc: make failed execv an exception (when using fork or clone)

startProcessAuxFork creates a pipe, which is used by a child to pass
an error code if execv fails.
osproc: use push stacktrace:off instead of nostackframe
Merge pull request #917 from zielmicha/vfork

osproc: Raise exception if execv fails in child process