Do not own /usr/{bin,lib}
Merge pull request #42 from piojo/fix-packaging

Do not own /usr/{bin,lib}
check explicitly for invalid function names (fix #43)
get stack trace right for error() calls (fix #40)
ensure line numbers are given when errors arise because of bad defaults (fix #37)
rename nlist -> dict in documentation (#13)
allow radix to be specified for to_long() (fix #36)