h5edit

New feature:
Add support for "RENAME <targetobject/old_attributename>  <new_attributename>"

test/testh5edit.sh:
    Unskipped the tests for the new feature. They were implemented before but
    were skipped to let "make check" to pass.
src/parse.y:
src/parse.c:
    Added support of the new syntax for RENAME command. Added both attribute_name_old
    to hold the old attributename.  "attribute_name" holds an attribute name temporary
    until it is copied to the new or old attribute name.
    Changed all debug output to stderr consistently so that they don't get mixed up
    with regular stdout output.
src/analyze.l:
src/analyze.c:
src/rename_copy_cmd.c:
src/misc.c:
    Changed all debug output to stderr consistently so that they don't get mixed up
    with regular stdout output.
doc/RELEASE.txt:
    Updated changes.

Tested: Passed on all 6 supported platforms (Linux 2.6 32bit and 64bits, Linux 2.6 on PowerPC,
Mac OS X 10.7.5 and 10.8.2, SunOS 5.11).