Rework storing files thoroughly. This includes:

o Remove the race between stat(2) & fopen(3) when creating
  a unique file.

o Improve bound checking when generating a unique name from
  a given pathname.

o Ignore REST marker on APPE.  No RFC specifies this case,
  but the idea of resuming APPE's implies this.

o By default, deny upload resumes and appends by anonymous users.
  Previously these commands were translated to STOU silently,
  which led to broken files on server without any notification
  to the user.

o Add an option, -m, to allow anonymous users to modify
  existing files (e.g., to resume uploads) if filesystem
  permissions permit.

Portions obrainded from:	OpenBSD
MFC after:			3 weeks

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