DOC: Increase Doxygen LOOKUP_CACHE_SIZE.

This value is increased to the value suggested at the end of a doxygen build.

This increases doxygen build performance at the cost of memory usage.  The
cache size will still be below 300 MB.

Change-Id: I4d902bd751d000c9f861e21cf778dda66faeabc8
COMP: Fix warning for InterpolateImageFunction wrapping

On the Linux-x86_64-gcc4.8-WrapITK dashboard computer, we get a lot of
errors like this one:

Nothing known about base class 'itk::ImageFunction< itk::Image< itk::RGBAPixel< unsigned short >,2u >,itk::RGBAPixel< double >,double >'. Ignored.

I do not get this error locally and other dashboard computers are happy.
This patch is an attempt to fix this by first wrapping the base class.

Change-Id: I47416bfaf0521d0e69a01004184dff4f94ac16b4
Merge topic 'doxygen'

ebb8beb0 DOC: Increase Doxygen LOOKUP_CACHE_SIZE.
Merge topic 'FixInterpoleWrapping'

e54ad2ba COMP: Fix warning for InterpolateImageFunction wrapping