tint2: update to 16.6.1

2018-08-05 16.6.1
2018-08-04 16.6
2018-08-04 16.5
2018-05-03 16.4
2018-04-17 16.3
- Bugfixes

2018-01-21 16.2
- Preliminary high DPI support

2017-12-20 16.0
- Added Spanish translation (contributed by Vicmz)
- Executor: updated tooltip documentation (issue #676)
- Systray: warn on duplicate config option systray_name_filter (issue #652)
- Taskbar: thumbnail support in tooltips
- Use C11 if possible to support generic printing for unit tests (should fall back to C99)

2017-09-02 15.0
- Panel:
  - _NET_WM_PID is set correctly, so now tint2 can be interacted with more easily from wmctrl and similar apps
- Taskbar: new config option taskbar_hide_different_desktop
- Battery:
  - New config option bat1_format and bat2_format
      - New config option battery_full_cmd
      - Better "Unknown" state handling
- Executor:
  - Hide if output is empty
  - If no user tooltip is set, displays the script standard error as tooltip.
    Tooltip is multiline, can be cleared with the VT100 clear screen sequence, in shell: (>&2 echo -en "\033[2J").
    Long tooltips are truncated to 4096 characters.
- Launcher:
  - Drag and drop now handles correctly text/uri-list
  - Support for Terminal=true
  - Support for %f and %F

(tnn)