Use lowercase for cmake commands consistenly

Inspired from https://github.com/InsightSoftwareConsortium/ITK/blob/master/Utilities/Maintenance/HowToCreateTheCMakeCaseConversion.txt
This needs vim 7.3 and fails with vim 7.4

This also fixes a number of :
- missing empty line at end of files
- useless space at end of lines

tests/nonregression/checkmd5refs.cmake

@@ -43,11 +43,11 @@ file(READ ${REFFILE} variable)
 foreach(pgxfullpath ${globfiles})
   file(MD5 ${pgxfullpath} output)
   get_filename_component(pgxfile ${pgxfullpath} NAME)
-  
+
   string(REGEX MATCH "[0-9a-f]+  ${pgxfile}" output_var "${variable}")
 
   set(output "${output}  ${pgxfile}")
-  
+
   if("${output_var}" STREQUAL "${output}")
     message(STATUS "equal: [${output_var}] vs [${output}]")
   else()