MCOL-507 Further ExeMgr performance improvements

This does the following:

* Switch resource manager to a singleton which reduces the amount of
times the XML data is scanned and objects allocated.
* Make the I_S tables use the FE implementation of the system catalog
* Make the I_S.columnstore_columns table use the RID list cache
* Make the extentmap pre-allocate a vector instead of many small allocs

writeengine/splitter/we_sdhandler.cpp

@@ -34,6 +34,7 @@
 using namespace std;
 
 #include "we_messages.h"
+#include "resourcemanager.h"
 
 #include <sys/time.h>
 
@@ -141,7 +142,6 @@ WESDHandler::WESDHandler(WESplitterApp& Ref) :
 		fRef(Ref),
 		fLog(),
 		fQId(101), // 101 - took it from air
-		fRm(),
 		fOam(),
 		fModuleTypeConfig(),
 		fDebugLvl(0),
@@ -167,6 +167,7 @@ WESDHandler::WESDHandler(WESplitterApp& Ref) :
 		fBrmRptVec(),
 		fpBatchLoader(0)
 {
+    fRm = joblist::ResourceManager::instance();
 }
 //------------------------------------------------------------------------------