MR !151 Review: address reviewer's comments

src/plugins/e-acsl/prepare_ast.ml

src/plugins/e-acsl/share/e-acsl/e_acsl_rtl.c

src/plugins/e-acsl/share/e-acsl/e_acsl_temporal_timestamp.h

...acsl/share/e-acsl/segment_model/e_acsl_segment_tracking.h

src/plugins/e-acsl/temporal.ml

src/plugins/e-acsl/temporal.mli

src/plugins/e-acsl/tests/temporal/oracle/gen_t_addr-by-val.c

...ins/e-acsl/tests/temporal/oracle/t_addr-by-val.err.oracle

...ins/e-acsl/tests/temporal/oracle/t_addr-by-val.res.oracle

src/plugins/e-acsl/tests/temporal/t_addr-by-val.c

src/plugins/e-acsl/visit.ml