Convert builtin help to reStructuredText source files

Run the convert-help.bash script to convert documentation:

 ./convert-help.bash "/path/to/CMake-build/bin"

Then remove it.

Modules/ProcessorCount.cmake

@@ -1,30 +1,41 @@
-# - ProcessorCount(var)
+#.rst:
+# ProcessorCount
+# --------------
+#
+# ProcessorCount(var)
+#
 # Determine the number of processors/cores and save value in ${var}
 #
-# Sets the variable named ${var} to the number of physical cores available on
-# the machine if the information can be determined. Otherwise it is set to 0.
-# Currently this functionality is implemented for AIX, cygwin, FreeBSD, HPUX,
-# IRIX, Linux, Mac OS X, QNX, Sun and Windows.
+# Sets the variable named ${var} to the number of physical cores
+# available on the machine if the information can be determined.
+# Otherwise it is set to 0.  Currently this functionality is implemented
+# for AIX, cygwin, FreeBSD, HPUX, IRIX, Linux, Mac OS X, QNX, Sun and
+# Windows.
 #
 # This function is guaranteed to return a positive integer (>=1) if it
-# succeeds. It returns 0 if there's a problem determining the processor count.
+# succeeds.  It returns 0 if there's a problem determining the processor
+# count.
 #
 # Example use, in a ctest -S dashboard script:
 #
-#   include(ProcessorCount)
-#   ProcessorCount(N)
-#   if(NOT N EQUAL 0)
-#     set(CTEST_BUILD_FLAGS -j${N})
-#     set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})
-#   endif()
+# ::
 #
-# This function is intended to offer an approximation of the value of the
-# number of compute cores available on the current machine, such that you
-# may use that value for parallel building and parallel testing. It is meant
-# to help utilize as much of the machine as seems reasonable. Of course,
-# knowledge of what else might be running on the machine simultaneously
-# should be used when deciding whether to request a machine's full capacity
-# all for yourself.
+#    include(ProcessorCount)
+#    ProcessorCount(N)
+#    if(NOT N EQUAL 0)
+#      set(CTEST_BUILD_FLAGS -j${N})
+#      set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})
+#    endif()
+#
+#
+#
+# This function is intended to offer an approximation of the value of
+# the number of compute cores available on the current machine, such
+# that you may use that value for parallel building and parallel
+# testing.  It is meant to help utilize as much of the machine as seems
+# reasonable.  Of course, knowledge of what else might be running on the
+# machine simultaneously should be used when deciding whether to request
+# a machine's full capacity all for yourself.
 
 # A more reliable way might be to compile a small C program that uses the CPUID
 # instruction, but that again requires compiler support or compiling assembler