Add test173 to check XML namespace detection

The Garmin TrackPointExtension must be in the right namespace to be
used, so ensure that when the tag is in a different namespace it is
ignored.

tests/data/test173.param

@@ -0,0 +1,5 @@
+TITLE='Ignore heading with incorrect TrackPointExtension namespace'
+PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
+COMMAND='$PROGRAM --heading --direction 0 -z 0 -g "$STAGINGDIR/track16.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
+RESULTCODE=0

tests/data/test173.result

@@ -0,0 +1,35 @@
+Reading GPS Data...
+Legend: . = Ok, / = Interpolated, < = Rounded, - = No match, ^ = Too far
+        w = Write Fail, ? = No EXIF date, ! = GPS already present
+
+Correlate: .
+
+Completed correlation process.
+Matched:     1 (1 Exact, 0 Interpolated, 0 Rounded).
+Failed:      0 (0 Not matched, 0 Write failure, 0 Too Far,
+                0 No Date, 0 GPS Already Present.)
+0x011a Image        XResolution                 Rational    1  72/1
+0x011b Image        YResolution                 Rational    1  72/1
+0x0128 Image        ResolutionUnit              Short       1  2
+0x0132 Image        DateTime                    Ascii      20  2012:11:22 12:34:56
+0x0213 Image        YCbCrPositioning            Short       1  1
+0x8769 Image        ExifTag                     Long        1  134
+0x9000 Photo        ExifVersion                 Undefined   4  48 50 49 48
+0x9003 Photo        DateTimeOriginal            Ascii      20  2012:11:22 12:34:56
+0x9004 Photo        DateTimeDigitized           Ascii      20  2012:11:22 12:34:56
+0x9101 Photo        ComponentsConfiguration     Undefined   4  1 2 3 0
+0xa000 Photo        FlashpixVersion             Undefined   4  48 49 48 48
+0xa001 Photo        ColorSpace                  Short       1  65535
+0xa002 Photo        PixelXDimension             Long        1  64
+0xa003 Photo        PixelYDimension             Long        1  64
+0x8825 Image        GPSTag                      Long        1  276
+0x0000 GPSInfo      GPSVersionID                Byte        4  2 2 0 0
+0x0001 GPSInfo      GPSLatitudeRef              Ascii       2  N
+0x0002 GPSInfo      GPSLatitude                 Rational    3  31/1 27/1 314816/10000
+0x0003 GPSInfo      GPSLongitudeRef             Ascii       2  E
+0x0004 GPSInfo      GPSLongitude                Rational    3  35/1 23/1 593916/10000
+0x0005 GPSInfo      GPSAltitudeRef              Byte        1  1
+0x0006 GPSInfo      GPSAltitude                 Rational    1  42191/100
+0x0007 GPSInfo      GPSTimeStamp                Rational    3  12/1 34/1 56/1
+0x0012 GPSInfo      GPSMapDatum                 Ascii       7  WGS-84
+0x001d GPSInfo      GPSDateStamp                Ascii      11  2012:11:22

tests/staging/track16.gpx

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<gpx xmlns:tc2="http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:gpxtpx="http://not-the-correct-xmlns.invalid/ThisCouldMeanJustAboutAnything" xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="TC2 to GPX11 XSLT stylesheet" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd">
+<trk>
+<name>Simulated Garmin track with both bearing/course extensions</name>
+<trkseg>
+<trkpt lat="31.4587449" lon="35.3998310">
+  <ele>-421.91</ele>
+  <time>2012-11-22T12:34:56Z</time>
+  <extensions>
+    <gpxtpx:TrackPointExtension>
+      <gpxtpx:speed>2.61</gpxtpx:speed>
+      <gpxtpx:course>289.76</gpxtpx:course>
+    </gpxtpx:TrackPointExtension>
+  </extensions>
+</trkpt>
+<trkpt lat="31.4587780" lon="35.3997909">
+  <ele>-420.40</ele>
+  <time>2012-11-22T12:35:20Z</time>
+  <extensions>
+    <gpxtpx:TrackPointExtension>
+      <gpxtpx:speed>2.21</gpxtpx:speed>
+      <gpxtpx:course>320.12</gpxtpx:course>
+      <gpxtpx:bearing>333.33</gpxtpx:bearing>
+    </gpxtpx:TrackPointExtension>
+  </extensions>
+</trkpt>
+</trkseg>
+</trk>
+</gpx>