change contribs download location (fixes #2849)
remaining changes for PDE X to be the default mode
fix OS X default File menu to be the same order as the other File menu
add workaround for #2841
move mode menu to the left of the Tool menu
fix TGA problems with Movie Maker (issue #2851)
turn off file change detection (#2852)
single line blocks are the devil
call getContentFile() in Java mode if file not found
change name, note more changes
write revisions file for 3.0a4