[src/set_{si,ui}_2exp.c] Added early underflow/overflow checking to

avoid integer overflow or errors due to special exponent values.

[src/set_uj.c] Added early overflow detection to avoid a possible
integer overflow. Fixed underflow detection.

[tests/tset_si.c] Added tests of mpfr_set_si_2exp and mpfr_set_ui_2exp
in precision 3 with integers from -31 to 31 and exponents MPFR_EXP_MIN,
MPFR_EMIN_MIN-7 to MPFR_EMIN_MIN, MPFR_EMAX_MAX-7 to MPFR_EMAX_MAX,
MPFR_EXP_MAX-7 to MPFR_EXP_MAX (testcases for the above bugs in
src/set_{si,ui}_2exp.c).

[tests/tset_sj.c] Added tests of mpfr_set_sj_2exp and mpfr_set_uj_2exp
in precision 3 with integers from -31 to 31 and the same exponents as
in tset_si.c, but also exponents INTMAX_MIN and INTMAX_MAX (testcases
for the above bugs in src/set_uj.c).

(merged changesets r13808-13809,13826,13832-13835 from the trunk)

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/branches/4.0@13836 280ebfd0-de03-0410-8827-d642c229c3f4

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