build-sys: default to ,/configure --enable-silent-rules
warnings: do not take abs() when data type is unsigned
warnings: mark unused function input variables
- warnings: fix couple unsigned vs signed variable comparisions
+ warnings: fix couple unsigned vs signed variable comparisons
warnings: multiply timeval seconds only when the value is small
- warnings: fix some missed unsigned vs signed variable comparisions
+ warnings: fix some missed unsigned vs signed variable comparisons
comment: add value range note to initialization
cast: do not downgrade to float when double should be used
warnings: remove dead code