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### Please describe the problem.
When `git-annex add`ing files with multiple dots in them, the `SHA256E`, `MD5E` (and presumably other `*E`) backends take the extension from the second-to-last dot, instead of the last dot.
This annoyed me because I have some photographs with names like `YYYY-mm-dd HH.MM.SS.jpg`. However, it might be intentional considering a `file.tar.gz` would have `tar.gz`.

### What steps will reproduce the problem?
[[!format sh """
$ touch a a.b a.b.c a.b.c.d
$ git-annex add .
add a ok
add a.b ok
add a.b.c ok
add a.b.c.d ok
$ git-annex lookupkey *
SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.b
SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.b.c
SHA256E-s0--e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.c.d
"""]]

### What version of git-annex are you using? On what operating system?
[[!format sh """
$ git-annex version
git-annex version: 6.20170101+gitg93d69b1-1~ndall+1
build flags: Assistant Webapp Pairing Testsuite S3(multipartupload)(storageclasses) WebDAV Inotify DBus DesktopNotify ConcurrentOutput TorrentParser MagicMime Feeds Quvi
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 SHA1E SHA1 MD5E MD5 WORM URL
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
local repository version: 5
supported repository versions: 3 5 6
upgrade supported from repository versions: 0 1 2 3 4 5
operating system: linux x86_64
"""]]

NeuroDebian's `git-annex-standalone` package on Xubuntu 16.04. (Also with a Debian sid chroot with their own `git-annex 6.20161210-1`)

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

I'm trying to analyze and organize my huge `Photos` folder into a neat git-annex repository (with yet another [project of mine](https://www.github.com/alpernebbi/albumin)). It's a huge mess.

Keep up the great work! Also thanks for fixing [my UTF-8 problem](https://git-annex.branchable.com/bugs/Linux_standalone__39__s_metadata_--batch_can__39__t_parse_UTF-8/) as well.