#137 Friendly names for EXIF tags

[Tomasz Golinski]

It would be great if user could change long names of
some exif tags to something shorter, i.e.
MkN.Canon.FocalLength.Long to Lens.Long. Long names
require wide exif tab and there is very little space
left for image. If it is difficult, maybe different
alignment of info in exif tab would do? (I can fix it
by editing the source, but it is somewhat awkward solution)

Also, inclusion of some exif data in OSD would be great.