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+
+
+Put explicit length constraints on new target names:
+
+    0 < len(name) < some max value
+
+Consider making -x interact with -c and -g
+
+Check all examples in the doc.
+
+Test on Windows and Linux.
+
+
+Documentation
+-------------
+
+
+- Get rid of the toggles and their associated docs having to do with
+  resetting options to their default state.  No longer needed now that
+  we're not allowing option-target pairs.
+
+- -v now continues after displaying results.  This allows it
+   to go into log outputs.
+
+- Note that multiple items sharing the same sequencing key (ctime,
+  size) will be ordered alphabetically within that key.
+
+- Change -f description to indicate that it will merely rename (not
+  remove) the existing target.
+
+- Document -S (Default: ".backup")
+
+- Note limit of total new filename length is 255.
+
+- Document -w linelength option. Default: 80.  Program determines
+  min output length. ONLY for error and info output (which can
+  be long).  Ordinary program output like usage and version info
+  ignores this.  If capturing for log/analysis, set this very wide.
+
+- Get rid of references to option-target pairs.  Note that from the
+  first non-option string forward, everything is understood to be
+  a filename even if it is in -option format.
+
+- Document -R rensep - single char
+
+- Document, all the stat-based sequences as well as alpha asc- desc-
+
+- Note importance of doing -d last, right before filename args to
+  get most current state of prog.
+
+- Note that '\' may itself have to be escaped on the shell command line.
+
+- Note the -E only applies during renaming operations.  Other errors will
+  halt program.
+
+- Changed option -1 to -G
+
+- -r  =something -> entire target name is replaced by "something"
+  -r  something= -> "something" is removed from the target name
+
+- Note that twander can be used as a GUI frontend for tren.
+
+- Note the use of docutils/resturctured text in producing the docs.
+
+- Document -P escape single char.
+
+- Changed option -l to -L.
+
+- Document overlapping renames:
+
+    - Because of overlapping substitutions
+
+        Note specific multi-rename semantics disjoint, overlapping, reduced
+        string length.
+
+    - Because of filename collisions
+
+       Note the potential problem of:
+
+        Rename: x -> x1 causes existing to be renamed x1.backup
+   
+        Now a rename of x1 -> z1 still works *but we're renaming a different file* (originally x)
+
+        Do this repeatedly and you'll wipe out all but the last file and backup
+
+- Backups can be backed up:
+
+  foo.backup.backup.backup...
+
+- Note that -q clobbers ALL informational output, even during test
+  runs: -qt does not make sense
+
+- The whole name/extension distinction has been removed.  The eliminates the following options:
+
+   -a
+   -b
+   -e
+   -L
+