ImageIngester User's Manual updated

[Marc Rochkind]

Added information about entering special characters (page 28); basing a
new metadata template on an existing one (page 30; other mentions of
this technique were already present in version 2.1.00); getting new and
old file names into metadata (page 33); Folder Options on Windows to
see Application Data paths (page 56); ingesting from cameras that use
DNG as their native format, such as the Leica M8 (page 24); use with
Lightroom (page 47).

--Marc