Merge sapi/phpdbg into PHP-5.6

diff --cc sapi/phpdbg/phpdbg_help.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_lexer.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_lexer.l
Simple merge

diff --cc sapi/phpdbg/phpdbg_list.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_parser.c
Simple merge

diff --cc sapi/phpdbg/phpdbg_parser.y
Simple merge