* ruby.c (set_arg0): long strings for $0 dumped core.
* ruby.c (set_arg0): use setprogtitle() if it's available.
* io.c (rb_io_popen): accept integer flags as mode.
* file.c (rb_find_file_ext): extension table can be supplied from
outside. renamed.
* eval.c (rb_f_require): replace rb_find_file_noext by
rb_find_file_ext.
* eval.c (rb_provided): should also check feature without
extension.
* numeric.c (flo_to_s): do not rely on decimal point to be '.'
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1721 b2dd03c8-39d4-4d8f-98ff-823fe69b080e