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Add Translation for Basque

Very Good coverage.

Translations contributed by:
 alexgabi
 gorkaazk <gorkaazkarate@gmail.com>
 Alaitz Gabilondo <alaitzgabi@gmail.com>

Signed-off-by: Rob Norris <rw_norris@hotmail.com>
Add beginnings of Slovak translation.

Translations contributed by:
  Ján Neščivera <jan.nescivera@gmail.com>

Signed-off-by: Rob Norris <rw_norris@hotmail.com>
Remove OSM web link layer options so you now get what ever is the OSM default.

At some point in time these layer options must have changed in OSM,
 as a long time ago (late 2008) I think our intention was meant to go to Mapnik view,
 however it would now give the Transport Layer map (which didn't exist back then).
Releasing Viking 1.5
Move tooltips
Enable widget sensitivity in the layer properties to be controlled.

Some settings are only relevant when other settings are in the right state.

Allow control of the sensitivities to be adjusted when changes to the widget values have been made.
Changes to each widget have to be considered separately (referenced via the parameter enumeration numbers).

Also expose the label widgets so they many be controlled.

ATM control these settings:
Maps:
 Auto Download -> Auto Download Only Missing
TrackWaypoints:
 Waypoint Draw Labels -> Font Size, Colour, BG Colour & BG Translucency.
 Waypoint Draw Image -> Image Size, Image Alpha + Cache Size.
 Track Draw Mode -> All Tracks Colour

NB Since most track settings have been split across into the Advanced tab,
 IMHO controlling sensitivities of widgets in another tab is not obvious,
 so these relationships have not been changed.
Directly support reading from MBTile files using libsqlite3.
Expand mapcache hash to include a hash of the map filename (if there is one).

This enables having multiple MBTiles (or multiple on Disk OSM Tile Format) Maps,
 since they each respectively have the same Map Id number,
 previously the hash key would have clashed.
Allow creating a File Chooser dialog with optional file filters.
[QA] Fix typo + grammar in a comment
[WINDOWS] Build with SQLite DLL 3.8.0.2
[WINDOWS] More reliable rebuilds.
Merge branch 'MBTilesRead'
Fix configure error message
Fix 'export_to_common' dialog

Use a standard file chooser. This ensure to keep the right aspect of
the dialog (similar width and height).
Fix translatable string with variable argument

A good practice in translation is to avoid to concat strings but use
%s C format argument. This allow translators to decide where to put the
argument in the translated string.
Merge commit 'refs/top-bases/t/export/gpsbabel' into t/export/gpsbabel

Conflicts:
	src/viktrwlayer.c
Add a first entry to invite user to change the selection