Merge sapi/phpdbg into PHP-5.6

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

diff --cc sapi/phpdbg/tests/commands/0002_set.test
Simple merge

diff --cc sapi/phpdbg/tests/commands/0103_register.test
Simple merge

diff --cc sapi/phpdbg/tests/commands/0106_compile.test
Simple merge

diff --cc sapi/phpdbg/tests/run-tests.php
Simple merge