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Add man pages for posix_spawn_file_actions_add{f,}chdir from piyush

Fix typo.

Rephrase sentence about vfork+exec in posix_spawn(3)

Try to make it less confusing.

Requested by <joerg>

Document that posix_spawn(3) uses a dedicated syscall

vfork+exec operations are done in one go. This is important information for
programs that wrap posix_spawn(3).

Quote the name "Ed" to avoid confusion with the macro "Ed".

Correct outdated note that posix_spawn(3) is implemented with vfork(2)

The original FreeBSD libc code uses vfork(2), it's not the case for NetBSD
as there is a dedicated kernel syscall.

Bump date for previous.

Limit the amount of kernel memory a posix_spawn syscall can use (for handling
the file action list) by limiting the maximum number of file actions to
twice the current file descriptor limit.
Fix a fe

Limit the amount of kernel memory a posix_spawn syscall can use (for handling
the file action list) by limiting the maximum number of file actions to
twice the current file descriptor limit.
Fix a few bugs in the support functions and document the new limit.
From Maxime Villard.

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Use Mt for email addresses.

Use major.minor for NetBSD versions.

Fix sched_set{param,scheduler} sections.

Add userland part of posix_spawn. Libc functions imported from FreeBSD.
Based on Charles Zhang's summer of code project.