[gtorrentviewer/f13/master] (5 commits) ...Improve tracker support (#674726)

[Paul Howarth]

Summary of changes:

  1cdb244... - Fix FTBFS due to missing -lm linking for ceil function (# (*)
  4c9e74e... Fix crash when "Refresh" button in "Tracker Details" tab is (*)
  eb70762... dist-git conversion (*)
  f7db0a6... Merge branch 'master' into f13 (*)
  1dfa134... Improve tracker support (#674726) (*)

(*) This commit already existed in another branch; no separate mail sent