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- To change the app version:
   - Edit photoname.cabal
   - Edit src/Photoname/Opts.hs, usageText near the bottom of footer

   I'd like to make a script in util/ to automate this.
   After such a script has been made, may want to put developer notes on using it in doc/dev/<somefile>

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File naming format:

yyyymmdd_[oth_]nnn[-e[n]].jpg
yyyymmdd-hhmmss[_oth][_ss].jpg

date: year month day
time: hour minute second
oth: could be photographer: 2 or 3 character initials
ss: edited or sized, optional number for more than one
   _sp _ep : sized/edited for printing
   _sd1920x1080 _ed : sized/edited for desktop
   _sw _ew : sized/edited for web


These files are arranged into a dir structure

top-level/
   0000/
      0000-00-00/
         00000000_001.jpg   -- Unknown pictures
         00000000_002.jpg
   2006/
      2006-10-13/
         20061013_431.jpg
         20061013_509.jpg
   2007/
      2007-01-30/
         20070130_002.jpg
         20070130_119-ew.jpg
      2007-04-19/
         20070419_bmd_323.jpg
         20070419_bmd_325-sd.jpg