fopen zend wrapper and relative paths

The bug #11326 was closed after Zeev added the current executing file's directory to the search path, which solved half of the problem. The original bug #9673 though is still open, and the last comment is pointing to the other half of the problem, <dot> relative paths. Right now, in main/streams.c/_php_stream_fopen_with_path the <dot> case is dealt with right from the start and no other paths get expanded. What I propose in order to conclude this matter, to get an intuitive behavior and to remain fully compatible with older versions is to add only the current executing file's directory _after_ the cwd of the main file for <dot> path expansion. This way the "include" and "live" parts of a project get fully decoupled, nested includes work as expected (from everyone's perspective), no longer the need to carry arround a "root" variable (anticipating that the user may disregard the DOCUMENT_ROOT and install the product relative to something else), and the language scales a little bit better. I'm gonna start doing this right now if no one digs up any security problems that refused to cross my mind. D