Dynamic host,tag columns widths in snapshots command

[middelink]

Ok, this irritated me now long enough. Columns widths are now dynamic, with reasonable minimums.
Example output. Note how my FQDN hostname are way longer than 10 chars.

$ ../../../bin/restic -r rest:http://qnap.******:8000 snapshots
ID        Date                 Host                   Tags        Directory
----------------------------------------------------------------------
15ec968d  2017-03-02 01:18:03  bigbox.**.********.**  CH      ┌── /
                                                              │   /boot
                                                              │   /boot/efi
                                                              └── /home
9e860414  2017-03-02 03:49:02  rp1.**.********.**     CH      ┌── /
                                                              └── /boot
af61db20  2017-03-03 12:26:20  bigbox.**.********.**  CH      ┌── /
                                                              │   /boot
                                                              │   /boot/efi
                                                              └── /home
167a5e40  2017-03-03 21:35:04  abuseio.********.**    NL          /
bc407177  2017-03-04 00:30:22  bigbox.**.********.**  CH      ┌── /
                                                              │   /boot
                                                              │   /boot/efi
                                                              └── /home
d09476f9  2017-03-05 00:30:22  bigbox.**.********.**  CH      ┌── /
                                                              │   /boot
                                                              │   /boot/efi
                                                              └── /home

(excuse the ascii art, the program created it :P)

[codecov-io]

Codecov Report

Merging #854 into master will increase coverage by 0.36%.
The diff coverage is 17.64%.

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
+ Coverage    53.2%   53.57%   +0.36%     
==========================================
  Files          91       91              
  Lines        7511     7517       +6     
==========================================
+ Hits         3996     4027      +31     
+ Misses       2918     2888      -30     
- Partials      597      602       +5

Impacted Files	Coverage Δ
src/cmds/restic/cmd_snapshots.go	40.9% <17.64%> (+34.81%)	✅

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[fd0]

Hm, this PR contains two commits from #853, wait for that PR to be merged into master and then rebase it? Maybe git is also smart enough to recognize this, we can try...

A small thing for further commits (you don't need to rework the existing ones): May I ask you to adhere to the general style we use for commits (short subject line, no dot at the end)? It is documented here: https://github.com/restic/restic/blob/master/CONTRIBUTING.md#git-commits

[middelink]

Ack on both your comments. I hope I remember the no-dot, they ingrain proper sentences at my work :P

[fd0]

Interesting, I suppose that's a cultural thing. Are you also using git at work?

I can also add an integration test which check the end of the subject line 😛

[fd0]

Ok, it let me merge this just fine.

[middelink]

Awesome! I shall try to not stack PRs on top of each other in the future.