fixed the web links, Daniel

doc/API.html

doc/APIchunk0.html

doc/APIchunk1.html

doc/APIchunk2.html

doc/APIchunk3.html

doc/APIchunk4.html

doc/APIchunk5.html

doc/APIchunk6.html

doc/APIchunk7.html

doc/APIconstructors.html

doc/APIfiles.html

doc/APIfunctions.html

doc/APIsymbols.html

doc/FAQ.html

doc/bugs.html

doc/contribs.html

doc/docbook.html

doc/docs.html

doc/downloads.html

doc/extensions.html