- Fix incorrect numbering of pitch speed/quality flags in the auxiliary C wrapper header. The effect of this was that code using the C wrapper that intended to select the higher-quality pitch-shift mode was actually choosing the higher-speed mode, and vice versa.
- Improve error handling in command-line utility.
- Fix some compiler warnings.
- Install the JNI target (with make install) only if it has actually been built, avoiding an error otherwise.