Fix new[]/delete missmatches and memory leaks found by clang's ASAN

Sometimes memory was allocated with new[] but freed with delete instead
of delete[], which is wrong.
And there were some small memory leaks, too.
Furtunately clang's AddressSanitizer detected all that so I could easily
fix it.

(There seem to be some more small memory leaks which are harder to fix,
though)

d3xp/Pvs.cpp

@@ -861,20 +861,20 @@ idPVS::Shutdown
 */
 void idPVS::Shutdown( void ) {
 	if ( connectedAreas ) {
-		delete connectedAreas;
+		delete[] connectedAreas;
 		connectedAreas = NULL;
 	}
 	if ( areaQueue ) {
-		delete areaQueue;
+		delete[] areaQueue;
 		areaQueue = NULL;
 	}
 	if ( areaPVS ) {
-		delete areaPVS;
+		delete[] areaPVS;
 		areaPVS = NULL;
 	}
 	if ( currentPVS ) {
 		for ( int i = 0; i < MAX_CURRENT_PVS; i++ ) {
-			delete currentPVS[i].pvs;
+			delete[] currentPVS[i].pvs;
 			currentPVS[i].pvs = NULL;
 		}
 	}

game/Pvs.cpp

@@ -861,20 +861,20 @@ idPVS::Shutdown
 */
 void idPVS::Shutdown( void ) {
 	if ( connectedAreas ) {
-		delete connectedAreas;
+		delete[] connectedAreas;
 		connectedAreas = NULL;
 	}
 	if ( areaQueue ) {
-		delete areaQueue;
+		delete[] areaQueue;
 		areaQueue = NULL;
 	}
 	if ( areaPVS ) {
-		delete areaPVS;
+		delete[] areaPVS;
 		areaPVS = NULL;
 	}
 	if ( currentPVS ) {
 		for ( int i = 0; i < MAX_CURRENT_PVS; i++ ) {
-			delete currentPVS[i].pvs;
+			delete[] currentPVS[i].pvs;
 			currentPVS[i].pvs = NULL;
 		}
 	}

idlib/math/Polynomial.h

@@ -53,6 +53,11 @@ public:
 					explicit idPolynomial( float a, float b, float c, float d );
 					explicit idPolynomial( float a, float b, float c, float d, float e );
 
+					~idPolynomial() // DG: don't leak coefficient's memory!
+					{
+						Mem_Free16( coefficient );
+					}
+
 	float			operator[]( int index ) const;
 	float &			operator[]( int index );