* master:
  Bump
  Avoid Rust's oom_abort
  Allow specifying custom allocator in Rust
  Fix custom allocator not being used in #60
  free rows after remapping
  Initialize rows using heap for large images
  colordifference_stdc: use float as in SSE
  Add SONAME ABI VERSIOn
  Move setup VERSIOn to the top
  Install library and pkgconfig file in LIB_INSTALL_DIR
  Do not build libimagequant as unversioned DSO
  Update comments in mediancut.c
  de-recurse hist_item_sort_halfvar()