(non-bug) lilypond-book & secondary source files

[Cameron Crowe]

Just a thought--not a bug.

lilypond-book refuses to overwrite a main source file, but happily overwrites 
secondary source files included into the main source file. Irritating if you 
use the .tex extension for included chapters of a musicological document and 
even just accidentally call lilypond-book without specifying a separate output 
dir.

"Don't do that." and "Version control!" would be perfectly good responses, and 
I probably have a few other minor (shrug-worth?) points if there is interest in 
hearing them.

In any case, I'm hugely fond of LP. Truly, thank you, devs and other 
contributors!

- Cam