Created directory structure.
Build script plus whatsnew file for 0.121.
Whatsnew for MAME 0.121u1.
Whatsnew for MAME 0.121u2.
Whatsnew for MAME 0.121u3.
Whatsnew for MAME 0.121u4.
Whatsnew for MAME 0.122.
Adding missing mamedirs.zip, needed for full builds.
Whatsnew.txt for MAME 0.122u1.
Updated build tools to generate diffs manually and accept an explicit revision number.
Whatsnew.txt for MAME 0.122u2.
Whatsnew.txt for 0.122u3.
Whatsnew.txt for 0.122u4.
Whatsnew for 0.122u5.
fixed me being incorrectly credited for some updates.
Whatsnew for 0.122u6.
Separated cleanup step from build step.
Whatsnew.txt for 0.122u7.
Whatsnew for 0.122u8.
Whatsnew for 0.123.
Updated build/cleanup scripts.
Whatsnew for 0.123u1.