Open Selection (Alt-D) regression

[ttcoder]

I'm in hrev50238 and this bug is back, same as in issue #9
It might have a different root cause though: looking at the Pe code repo, the code itself seems to have not been reverted, and the symptoms might be different (as in worse): none of the entries in the BEINCLUDES environement variable are opened, now, whereas in the past instance of this bug one could open headers from /boot/system/develop/headers/posix if not from develop/os/interface and the like

I should be able to revert to an older Pe, but if someone can take a look at this that'll be appreciated :-)

[ttcoder]

A new twist on this: if I bring over my old ~config/settings/pe/settings file to this new hrev, Alt-D look up works again perfectly. So no annoyance any more for this user. Seems there's (just) an odd interaction somewhere between settings and the code that parses environ variables