Planex 0.12.0

• Docker: allow passwordless sudo for the build user
• planex-patchqueue: Add a new utility to create a patchqueue based on
  a spec file and a locally checked-out Git repository
• planex-pin has been removed and replaced by planex-patchqueue
• planex-makesrpm: Do not extract all files in source directories
• spec: Report local sources and patches separately
• makesrpm: Extract patches and sources separately
• Add utility classes for dealing with links, tarballs and patchqueues
• planex-makesrpm: Require 'patches' to be declared explicitly in
  link files
• Tools which accepted the --topdir and --dist arguments now accept
  rpmbuild-style --define arguments
• planex-extract: Do not unpack patches or rewrite spec files
• planex-makesrpm: Consume the patch queue tarball directly, rather
  than requiring it to be unpacked
• Makefile.rules: Don't symlink SOURCES into _build, and keep local
  and downloaded sources separate