[add] Don't override tag values when re-adding.
GPS valuetype.
[add] Tag with GPS coords from EXIF.
VTdatetime can take (unixtime, fuzz).
[add] Add -o to override existing tags.
GPS altitude.
[exif] Unbreak makernote parsing again (broken by GPS).
[add] Also override imgdate with -o.
[add] Can override file type detection.
[client] Post ordering could fail on long lists.
[rmpost] Unbreak deleting posts with weak tags (again..)
[client] VTgps should have a single fuzz in meters, and work.
[implies] I missed giving priority as third positional arg.
[client] Fix max_len check in tag_post.
[client] postspec2md5 shouldn't read files in ordered wellpappfs dirs.
[add] Fix list-like lenstags (Nikon) with modern pyexiv2.
[add] Identify movies from my phone ("3gp") as mov.
[add] Don't consider files in wellpappfs as linking targets.
[tagwindow] Never remove typed characters during completion.

This could happen if fuzzy matching expanded to tags with a shorter common
prefix than the typed characters. In this case the user input is now left
alone (and a completion list shown as usual).