merge conflict issue _1965_

/* Note: each compile switch (FIX_1101_...) is independent from the other ones */

#define ISSUE_1836_replace_overflow_libcom                   /* FhG: replace overflow operators by non-overflow-alternatives in lib_com - BE */

#define FIX_ISSUE_1965_REPLACE_CARRY_OVERFLOW                /* FhG: bit-exact, replace carry and overflow operations by 64-bit operations, MR 2166 */

#define ISSUE_1836_replace_overflow_libcom                   /* FhG: replace overflow operators by non-overflow-alternatives in lib_com - BE */

#define FIX_1942_ASSERTION_LOWSHELF                          /* FhG: Modified the target_gains_db_fx calculation in compute_t60_coeffs_fx() */

#define FIX_1944_CRASH_FOR_STEREO                            /* FhG: improve TonalMDCTConceal_InsertNoise calculation precision */

#define FIX_1970_SBA_CRASH                                   /* Dlb: Fix for issue 1970, SBA crash */