Help: Add CAPTURE_CMAKE_ERROR to ctest_submit and ctest_update documentation

Also, added CAPTURE_CMAKE_ERROR to vim synax file for ctest_submit,
ctest_update and ctest_memcheck.

Help/command/ctest_submit.rst

@@ -10,6 +10,7 @@ Perform the :ref:`CTest Submit Step` as a :ref:`Dashboard Client`.
                [RETRY_COUNT <count>]
                [RETRY_DELAY <delay>]
                [RETURN_VALUE <result-var>]
+               [CAPTURE_CMAKE_ERROR <result-var>]
                [QUIET]
                )
 
@@ -52,6 +53,10 @@ The options are:
   Store in the ``<result-var>`` variable ``0`` for success and
   non-zero on failure.
 
+``CAPTURE_CMAKE_ERROR <result-var>``
+  Store in the ``<result-var>`` variable -1 if there are any errors running
+  the command and prevent ctest from returning non-zero if an error occurs.
+
 ``QUIET``
   Suppress all non-error messages that would have otherwise been
   printed to the console.

Help/command/ctest_update.rst

@@ -5,7 +5,10 @@ Perform the :ref:`CTest Update Step` as a :ref:`Dashboard Client`.
 
 ::
 
-  ctest_update([SOURCE <source-dir>] [RETURN_VALUE <result-var>] [QUIET])
+  ctest_update([SOURCE <source-dir>]
+               [RETURN_VALUE <result-var>]
+               [CAPTURE_CMAKE_ERROR <result-var>]
+               [QUIET])
 
 Update the source tree from version control and record results in
 ``Update.xml`` for submission with the :command:`ctest_submit` command.
@@ -20,6 +23,10 @@ The options are:
   Store in the ``<result-var>`` variable the number of files
   updated or ``-1`` on error.
 
+``CAPTURE_CMAKE_ERROR <result-var>``
+  Store in the ``<result-var>`` variable -1 if there are any errors running
+  the command and prevent ctest from returning non-zero if an error occurs.
+
 ``QUIET``
   Tell CTest to suppress most non-error messages that it would
   have otherwise printed to the console.  CTest will still report