-Using RESIZE_DP_DSP_DATA in corr_accumulator;

-Fixed corr_adder sign extension;
-Added g_inter_channel_delay to corr_visibility_buffer and fixed the 
 calculation of dp_src_out_timer's generics based on constants;
-Renamed g_nof_input_folds to g_input_unfold_factor in correlator.vhd;
-Added generics to tb_correlator to indicate which ones can be user set;
-Fixed the output location of the .rec file (moved to tb dir);
-Verified in sim using verify_correlator.py.