Closes #4344 by checking if a file has no embedded exposure date, and if it doesn't, checking the row's exposure date against the file's timestamp.
Closes #4344 by checking if a file has no embedded exposure date, and if it doesn't, checking the row's exposure date against the file's timestamp.

damianmoore/shotwell,polymeris/shotwell,jimbonator/shotwell,ritchiewilson/shotwell,damianmoore/shotwell,jof/shotwell,Sanva/shotwell-gsoc,Sanva/shotwell-gsoc,Sanva/shotwell-gsoc,jimbonator/shotwell,h4ck3rm1k3/shotwell,h4ck3rm1k3/shotwell,polymeris/shotwell,jof/shotwell,ritchiewilson/shotwell,abrauchli/shotwell,polymeris/shotwell,ritchiewilson/shotwell,damianmoore/shotwell,h4ck3rm1k3/shotwell,jimbonator/shotwell,abrauchli/shotwell,jof/shotwell,abrauchli/shotwell