Document and fix default-sort-order preference

 This patch resolves three related issues:

The first issue was that the GSettings schema for Caja did not include an
entry to sort by the "btime", or creation date, of files.  If the user chose
such an option in the Caja Preferences, GSettings would produce a warning
(often out-of-sight, as it was usually redirected into the user's
.xsession-errors file), and Caja would not actually change the default
sort-order of files.  This patch adds the btime as a valid setting in the
schema.

The second issue was that. because of the above (an entry in the settings
schema was missing), some of the alternative sort orders listed in the schema
(everything after and including "atime") were not assigned the same numbers
as the sort orders listed elsewhere in the Caja source code.  Specifically,
in icon- and compact-views, if the default sort-order was "emblems", the
observed / actual sort-order would be the entry before "emblems", namely
"atime" -- so instead of sorting by the names of associated emblems, Caja
would sort by each file's access time.  An array in the code for the
list-view also was missing many values and included some values out of order,
so the default sort-order setting affected directories viewed in list-view
mode seemingly randomly.  The former is taken care of using the fix described
in the above paragraph; the latter is fixed in this patch by adding /
reorganizing the array for the list-view sort-orders appropriately.

The third issue (admittedly, a lesser issue) was that the documentation for
the default-sort-order setting was lacking -- it at least did not list all
the possible values that the setting could accept.  In this patch, I resolve
this issue by listing all values in the setting's description, and also go
into more detail about what each value does.  (However, perhaps I included
a little too much detail.  It'll only benefit [supposed power users who may
already know this stuff] who use GSettings or DConf directly, and it'll
certainly be a headache for translators.  I'll admit that.)

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