小修改

Signed-off-by: shines77 <gz_shines@msn.com>
完成了jmc_dtos()函数filed_width < precision + 1的情况;

Signed-off-by: shines77 <gz_shines@msn.com>
新增了ftol_test()和dtol_test().

Signed-off-by: shines77 <gz_shines@msn.com>