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bc8b7568 - libtextstyle: Add is_instance_of_* predicates.

libtextstyle: Add is_instance_of_* predicates. * libtextstyle/gnulib-local/lib/fd-ostream.oo.h (is_instance_of_fd_ostream): New declaration. * libtextstyle/gnulib-local/lib/fd-ostream.oo.c (is_instance_of_fd_ostream): New function. * libtextstyle/gnulib-local/lib/file-ostream.oo.h (is_instance_of_file_ostream): New declaration. * libtextstyle/gnulib-local/lib/file-ostream.oo.c (is_instance_of_file_ostream): New function. * libtextstyle/gnulib-local/lib/html-ostream.oo.h (is_instance_of_html_ostream): New declaration. * libtextstyle/gnulib-local/lib/html-ostream.oo.c (is_instance_of_html_ostream): New function. * libtextstyle/gnulib-local/lib/html-styled-ostream.oo.h (is_instance_of_html_styled_ostream): New declaration. * libtextstyle/gnulib-local/lib/html-styled-ostream.oo.c (is_instance_of_html_styled_ostream): New function. * libtextstyle/gnulib-local/lib/iconv-ostream.oo.h (is_instance_of_iconv_ostream): New declaration. * libtextstyle/gnulib-local/lib/iconv-ostream.oo.c (is_instance_of_iconv_ostream): New function. * libtextstyle/gnulib-local/lib/memory-ostream.oo.h (is_instance_of_memory_ostream): New declaration. * libtextstyle/gnulib-local/lib/memory-ostream.oo.c (is_instance_of_memory_ostream): New function. * libtextstyle/gnulib-local/lib/noop-styled-ostream.oo.h (is_instance_of_noop_styled_ostream): New declaration. * libtextstyle/gnulib-local/lib/noop-styled-ostream.oo.c (is_instance_of_noop_styled_ostream): New function. * libtextstyle/gnulib-local/lib/styled-ostream.oo.h (is_instance_of_styled_ostream): New declaration. * libtextstyle/gnulib-local/lib/styled-ostream.oo.c (is_instance_of_styled_ostream): New function. * libtextstyle/gnulib-local/lib/term-ostream.oo.h (is_instance_of_term_ostream): New declaration. * libtextstyle/gnulib-local/lib/term-ostream.oo.c (is_instance_of_term_ostream): New function. * libtextstyle/gnulib-local/lib/term-styled-ostream.oo.h (is_instance_of_term_styled_ostream): New declaration. * libtextstyle/gnulib-local/lib/term-styled-ostream.oo.c (is_instance_of_term_styled_ostream): New function. * libtextstyle/lib/textstyle.h (is_instance_of_styled_ostream, is_instance_of_file_ostream, is_instance_of_fd_ostream, is_instance_of_term_ostream, is_instance_of_memory_ostream, is_instance_of_iconv_ostream, is_instance_of_html_ostream, is_instance_of_term_styled_ostream, is_instance_of_html_styled_ostream, is_instance_of_noop_styled_ostream): New declarations. * libtextstyle/tests/test-instanceof.c: New file. * libtextstyle/tests/Makefile.am: Arrange to compile it. * libtextstyle/doc/libtextstyle.texi (The output stream hierarchy): Mention the is_instance_of_* predicates. * libtextstyle/NEWS: Mention the new functions.