Added a few RCS $Id$ tags.
# Note: I have avoided changing any .h files if the corresponding .c file
# had not already been changed as I am not sure if there are any legal
# issues here. So some extensions still have PHP 3 headers.
There are 2-3 third-party libs in PHP which use DEBUG and I left them
this way (primary example is pcrelib).
- Please test things and Andrei, can you check that pcrelib stopped
printing the warning messages?