ENH: Mark BSplineWarping2Test as RUNS_LONG.

To clear up the

  RogueResearch6 Mac10.9-clang-dbg-x86_64-static

dashboard build.

Change-Id: I04b56308adee060dbfad064faea5f7f769bd5844
BUG: Fix Nifti IO read with large images.

Prevent overflow of int with large images.

Suggested-by: Kris Thielemans <kris.f.thielemans@gmail.com>

Change-Id: I020a53d97db359b7ae4d9d4c61f98e382a2dcaa1
Merge topic 'BSplineWarping2TestRunsLong'

bcdf0304 ENH: Mark BSplineWarping2Test as RUNS_LONG.
COMP: Fix vxl_config_macros usage of CMake check macros

Some CMake check macros used the idiom

  if("${VAR}" MATCHES "^${VAR}$")

to detect whether a variable is set.  In vxl_config_macros we were
abusing this implementation by using

  SET( ${VARIABLE} ${VARIABLE} )

to reset the check state.  This prevents the CMake macros from using

  if(NOT DEFINED "${VAR}")

instead of the old idiom.  Use the much cleaner

  UNSET(${VARIABLE})

instead.

Change-Id: Iabd613d6666cd3513a406f5c5c1479f205dbbf69
Merge topic 'LargeNifti_release'

1aa73298 BUG: Fix Nifti IO read with large images.
COMP: Remove call for non-existent variable in Nifti debugging.

"tobuffer" is not defined, causing a build error with
 __USE_VERY_VERBOSE_NIFTI_DEBUGGING__.

Suggested-by: Kris Thielemans <kris.f.thielemans@gmail.com>

Change-Id: I053ed70aa767d48a380407dec43d906086248b27
Merge topic 'fix-cmake-check-macro-usage'

d55d7572 COMP: Fix vxl_config_macros usage of CMake check macros
Merge topic 'NiftiDebugging'

ece4fa97 COMP: Remove call for non-existent variable in Nifti debugging.