improve appearance of VTK web example

In this commit we change some of the settings on our
delimited text table reader.  This results in improved
appearance for our phylogenetic visualization.

We tell the table reader to detect numeric columns so
our visualization will know to use the continuous data
color scheme for these columns.

We also tell the table reader that our input .csv file
has column headers.  This results in the correct column
labels being displayed in the resulting visualization.

Change-Id: I9d5e8a13a6f705c102df6fa2ba0f9cd5734cbab8
Merge topic 'update_vtkweb_phylo' into master

d547d0df improve appearance of VTK web example
Merge topic 'forward-to-vtk-master' into pv-master

55647b7 Merge topic 'chart-zoom-axis' into master
45a2e6c Add ZOOM_AXIS interaction mode to vtkChart
945e264 Merge topic 'mingw-matrix4x4-warning' into master
377c265 Merge topic 'gdal-point-precision' into master
5d1e5c9 Merge topic 'example-simple-view' into master
8d10811 Merge topic 'surface-lic-dashboard-cleanup' into master
f2b4974 Merge topic 'dataarraytemplate-getarraytype' into master
bad6627 Add missing GetArrayType virtual implementation.
54dafff Surface LIC: fix unused variable warning on Linux
9fe4a44 Merge topic 'bitarray-warning-fix' into master
338266d Fix copy/paste typos in vtkBitArray::InsertTuples.
d78918e Merge topic 'glyph3d-batch-copies' into master
36fd8c7 Performance tweaks to Glyph3D.
777630c Merge topic 'surface-lic-dashboard-cleanup' into master
cd7bc9e Merge topic 'textmapper-fix' into master
792d3ad Ensure that the number of points is suitable for the cell.
...
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I2e23bbb127ed31348778c26a639bb4452b577ad0
fix freeze on large dendrograms

This commit fixes a bug where vtkDendrogramItem would hang
under certain circumstances while rendering a large tree.
The problem was in vtkContext2D::ComputeFontSizeForBOundedString.
It was possible for the font size to become negative.  This
resulted in an infinite loop.  An explicit check for a minimum
font size now prevents this from happening.

This commit also contains some minor indentation fixes within
vtkDendrogramItem.cxx.

Change-Id: Idc7b3b010473276df8c31adb43268936f67216f6
fix mem leak in test

Change-Id: Ic29c0d477d9960520385408bd783f822d8116448
Merge topic 'fix_large_tree_performance' into master

2d4f0a02 fix freeze on large dendrograms
Merge topic 'fix-valgrind-leak' into master

71ac5541 fix mem leak in test