Currently unmounting an NFS share fails if another user has the explorer
open in the same share. This leads to orphaned network drives that
cannot be removed (only be rebooting). When this happened 26 times (i.e.
users logged on and off 26 times), mounting NFS shares does not work
anymore (system error 1794). This workaround makes it work longer and
allows for "fixing" the problem by rebooting the machine periodically.
added 2011 year to the copyright line
added authors info to the license
added UofM license to libtirpc files that we modified
(but i probably missed some)
