commit: Unix font manager

[Tomas Frydrych]

Added an extra Unix-only preference that makes it possible for the 
user to stop AW from modifying the font path altogether.

Tomas
changed: xap_UnixFontManager.cpp, xap_PreferenceSchemeId.h, 
xap_StringId.h, ap_UnixDialog_Options.h/cpp, en-US/faq.html