[RFC 00/12 V2] Visit varobj available children only in MI

[Yao Qi <yao at codesourcery dot com>]

This is the V2 of this patch series, addressing Keith's review comments
to V1 (reviewed in Jan 2014).  The general description of this series
can be found https://sourceware.org/ml/gdb-patches/2013-11/msg00739.html

Changes in V2 are:

 - Include NEWS and doc.
 - Fix typos, grammatical mistakes, and changelog entries.
 - Update copyright year from "2013" to "2013-2014" for new files.
 - Use -list-features to return "available-children-only" (#7).
 - Update config/djgpp/fnchange.lst for new tests.
 - Fix a missing cleanup (#2).
 - Call varobj_delete_iter in free_variable (#3).

Regression tested on x86_64-linux.

*** BLURB HERE ***

Yao Qi (12):
  Use 'struct varobj_item' to represent name and value pair
  Generalize varobj iterator
  Iterate over 'struct varobj_item' instead of PyObject
  Remove #if HAVE_PYTHON
  Rename varobj_pretty_printed_p to varobj_is_dynamic_p
  Use varobj_is_dynamic_p more widely
  MI option --available-children-only
  Iterator varobj_items by their availability
  Delete varobj's children on traceframe is changed.
  Match dynamic="1" in the output of -var-list-children
  Test case
  NEWS and Doc on --available-children-only

 gdb/Makefile.in                                    |   17 +-
 gdb/NEWS                                           |    7 +
 gdb/config/djgpp/fnchange.lst                      |    4 +
 gdb/doc/gdb.texinfo                                |   62 +++-
 gdb/mi/mi-cmd-var.c                                |  136 +++++++--
 gdb/mi/mi-main.c                                   |    1 +
 gdb/python/py-varobj.c                             |  198 ++++++++++++
 gdb/python/python-internal.h                       |    4 +
 gdb/testsuite/gdb.trace/available-children-only.c  |   69 ++++
 gdb/testsuite/gdb.trace/available-children-only.cc |   45 +++
 .../gdb.trace/mi-available-children-only-cxx.exp   |  126 ++++++++
 .../gdb.trace/mi-available-children-only.exp       |  198 ++++++++++++
 gdb/testsuite/lib/mi-support.exp                   |   17 +-
 gdb/varobj-iter-avail.c                            |  162 ++++++++++
 gdb/varobj-iter.h                                  |   76 +++++
 gdb/varobj.c                                       |  327 ++++++++++----------
 gdb/varobj.h                                       |   15 +-
 17 files changed, 1257 insertions(+), 207 deletions(-)
 create mode 100644 gdb/python/py-varobj.c
 create mode 100644 gdb/testsuite/gdb.trace/available-children-only.c
 create mode 100644 gdb/testsuite/gdb.trace/available-children-only.cc
 create mode 100644 gdb/testsuite/gdb.trace/mi-available-children-only-cxx.exp
 create mode 100644 gdb/testsuite/gdb.trace/mi-available-children-only.exp
 create mode 100644 gdb/varobj-iter-avail.c
 create mode 100644 gdb/varobj-iter.h

-- 
1.7.7.6