Get rid of mentions of NTL

Documentation/doc/Documentation/Third_party.txt

@@ -179,17 +179,6 @@ optional: it is used by some models of the
 
 \mpfi can be downloaded from <A HREF="https://gitlab.inria.fr/mpfi/mpfi">`https://gitlab.inria.fr/mpfi/mpfi`</A>.
 
-
-\subsection thirdpartyNTL NTL
-<b>Version 5.1 or later</b>
-
-\ntl provides data structures and algorithms for signed, arbitrary
-length integers, and for vectors, matrices, and polynomials over the
-integers and over finite fields. The optional library \ntl is used by \cgal
-to speed up operations of the Polynomial package, such as GCDs. It is recommended to install \ntl with support from \gmp.
-
-\ntl can be downloaded from <A HREF="https://libntl.org">`https://libntl.org`</A>.
-
 \subsection thirdpartyESBTL ESBTL
 
 The \esbtl (Easy Structural Biology Template Library) is a library that allows

Documentation/doc/Documentation/advanced/Configuration_variables.txt

@@ -244,27 +244,6 @@ Similar variables exist for \rs3.
 | `RS3_LIB_DIR` | Idem | Environment |
 | `RS3_LIBRARIES` | Full pathname of the compiled \rs3 library | CMake |
 
-
-\subsection installation_ntl NTL Library
-
-Some polynomial computations in \cgal's algebraic kernel
-are speed up when \ntl is available.
-As the algebraic kernel is not compiled as a part of the \cgal
-library, this library is not detected nor configured at installation time.
-
-CMake will try to find \ntl in the standard header and library
-directories. When it is not automatically detected, the locations of the
-headers and library files must be specified using environment variables.
-
-| Variable             | Description           | Type        |
-| :-                   | :-                    | :-             |
-| `NTL_DIR` | Directory of \ntl default installation | Environment |
-| `NTL_INCLUDE_DIR` | Directory containing the `NTL/ZZX.h` file | CMake |
-| `NTL_INC_DIR` | Idem | Environment |
-| `NTL_LIBRARIES_DIR` | Directory containing the compiled \ntl library | CMake |
-| `NTL_LIB_DIR` | Idem | Environment |
-| `NTL_LIBRARIES` | Full pathname of the compiled \ntl library | CMake |
-
 \subsection installation_eigen Eigen Library
 
 \eigen is a header-only template library.

Documentation/doc/resources/1.14.0/BaseDoxyfile.in

@@ -93,7 +93,6 @@ ALIASES                = "cgal=%CGAL" \
                          "libpointmatcher=libpointmatcher" \
                          "core=Core" \
                          "mpfi=MPFI" \
-                         "ntl=NTL" \
                          "pdb=PDB" \
                          "esbtl=ESBTL" \
                          "tbb=TBB" \

Documentation/doc/resources/1.8.13/BaseDoxyfile.in

@@ -84,7 +84,6 @@ ALIASES                = "cgal=%CGAL" \
                          "libpointmatcher=libpointmatcher" \
                          "core=Core" \
                          "mpfi=MPFI" \
-                         "ntl=NTL" \
                          "pdb=PDB" \
                          "esbtl=ESBTL" \
                          "tbb=TBB" \

Documentation/doc/resources/1.9.6/BaseDoxyfile.in

@@ -93,7 +93,6 @@ ALIASES                = "cgal=%CGAL" \
                          "libpointmatcher=libpointmatcher" \
                          "core=Core" \
                          "mpfi=MPFI" \
-                         "ntl=NTL" \
                          "pdb=PDB" \
                          "esbtl=ESBTL" \
                          "tbb=TBB" \

Polynomial/include/CGAL/Polynomial/polynomial_gcd.h

@@ -38,10 +38,6 @@
 #include <CGAL/Polynomial/polynomial_gcd_implementations.h>
 #include <CGAL/polynomial_utils.h>
 
-#ifdef CGAL_USE_NTL
-#include <CGAL/Polynomial/polynomial_gcd_ntl.h>
-#endif
-
 #if CGAL_USE_INTERNAL_MODULAR_GCD
 #include <CGAL/Polynomial/modular_gcd.h>
 #endif
@@ -56,11 +52,6 @@
 //     c) over a field (unless integralized), use the Euclidean algorithm;
 //         over a UFD, use the subresultant algorithm
 //
-// NOTICE: For better performance, especially in AlciX, there exist special
-// modular implementations for the polynmials with coefficient type
-// leda::integer and the CORE::BigInt type which use, when the
-// NTL library is available.
-// see CGAL/Polynomial/polynomial_gcd_ntl.h
 
 namespace CGAL {
 namespace internal {