LIQ_QUALITY_TOO_LOW constant
Consistency in usage info
Name union for C99 compatibility

Fixes #86
Revert "Unnecessary +"

This reverts commit a85e3ba244ab09957a9eb4d39c50d03a02c7eb00.
Reuse macro

Indent
qsort wrapper
Merge commit '8dbc5f34b92396346b5b9189ee36576556971aaf' into HEAD