Familias 2.6.4

• Fixed C++20 compilation errors with gcc 15 and clang 21 (stream extraction into char* removed in C++20)

Familias 2.6.3

• Fixed c code problem with gcc15

Familias 2.6.2

• Fixed links in some Rd files
• Corrected an *** buffer overflow*** error flagged by one c-compilator