Update viking to 1.4.2.

Bug fix release only

Bug Fixes since 1.4.1:
* Fix menu use of named own Icons since the icons were renamed some time ago.
* [QA] Fix memory leak in drawing new tracks/routes.
* [QA] Fix memory leak on deleting TrackWaypoint layers.
* [QA] Fix large memory leak on viewing Track Properties.
* [QA] Fix incorrect iterator usage.
* [QA] Fix memory leaks on reading in Viking files.
* [QA] Fix memory leak in treeview tooltips and selection.
* [QA] Fix large memory leak when removing DEM layers.
* Fix some interpolated values of a trackpoint on insertion between points.
* Fix handling failed downloads with the My OSM Traces method.
* SF Bugs#101: Fix Acquire from Google Directions.
* Fix name search using Google.
* SF Bugs#100: Fix Crash on viewing Track Properties with extreme gradients.
* SF Bugs#97: Fix missing redownload settings of some maps in the example config
* SF Bugs#99: Increase limit for Map IDs
* Automated check for the latest version. ATM only on Windows systems.
* Enable getting Viking Version as a number from a string to enable comparisons.
* SF#3613971: Remove Geofabrik's OpenStreetMap WMS, as it is not for public use.
* Don't silently fail on attempting to split to a track.
* Fix background thread statusbar update instability.
* Fix location of gdk_threads_enter() to be before first window creation.
* Allow Bing Map source URL to be set via the configuration XML file.
* SF#3610708: Fix Failing to Load DEM files on Big Endian Systems.
* Fix incorrect setting to lowest zoom value when clicking away from
the statusbar zoom menu.
* [QA] Improve create zoom menu to use G_N_ELEMENTS to know array bounds.

Contributors
============

* Rob Norris
* Michael Klein

(gdt)