From 2.1.1.1 to 2.2:
- Major code rewrite/reorganization: should not change functionality (Karger)
- CleanTeX is now a *subroutine*, not a separate executable (Karger)
- Added -f option to clobber existing .lyx file (Karger)

From 2.1 to 2.1.1.1
- Many little bug fixes (Karger)
