Reorganization of headers (I): rename JSC -> ABACUS

All files need to be changed to refer to new headers.
First step of the reorganization.

src/COMBI/Combinatorics.cc

@@ -2,7 +2,7 @@
 
 This software is part of J.-S. Caux's C++ library.
 
-Copyright (c) 2006.
+Copyright (c) J.-S. Caux.
 
 -----------------------------------------------------------
 
@@ -10,15 +10,13 @@ Combinatorics.cc
 
 Defines all class related to combinatorics.
 
-LAST MODIFIED:  04/09/06
-
 ******************************************************************/
 
-#include "JSC.h"
+#include "ABACUS.h"
 
 using namespace std;
 
-namespace JSC {
+namespace ABACUS {
 
   Choose_Table::Choose_Table ()
     : Npower(0ULL), Npowerp1(1ULL), table(new unsigned long long int[1])
@@ -33,7 +31,7 @@ namespace JSC {
 
     // We can only go up to ULL_MAX:
     if (log(DP(ULLONG_MAX)) < DP(Npowerp1) * log(2.0))
-      JSCerror("Choose_Table:  too large to contruct.");
+      ABACUSerror("Choose_Table:  too large to contruct.");
 
     table = new unsigned long long int[dim];
 
@@ -62,8 +60,8 @@ namespace JSC {
 
   unsigned long long int Choose_Table::choose(int N, int M)
   {
-    if (N < 0 || N > Npower) JSCerror("N out of bounds in choose(N,M).");
-    if (M < 0 || M > Npower) JSCerror("M out of bounds in choose(N,M).");
+    if (N < 0 || N > Npower) ABACUSerror("N out of bounds in choose(N,M).");
+    if (M < 0 || M > Npower) ABACUSerror("M out of bounds in choose(N,M).");
 
     return(table[Npowerp1 * N + M]);
   }
@@ -86,4 +84,4 @@ namespace JSC {
   }
 
 
-} // namespace JSC
+} // namespace ABACUS