v0.16.1 (2021-02-22)

This minor release includes a new feature and associated fixes:

• intel-oneapi support through new packages (#20411, #20686, #20693, #20717,
  #20732, #20808, #21377, #21448)

This release also contains bug fixes/enhancements for:

• HIP/ROCm support (#19715, #20095)
• concretization (#19988, #20020, #20082, #20086, #20099, #20102, #20128,
  #20182, #20193, #20194, #20196, #20203, #20247, #20259, #20307, #20362,
  #20383, #20423, #20473, #20506, #20507, #20604, #20638, #20649, #20677,
  #20680, #20790)
• environment install reporting fix (#20004)
• avoid import in ABI compatibility info (#20236)
• restore ability of dev-build to skip patches (#20351)
• spack find -d spec grouping (#20028)
• spack smoke test support (#19987, #20298)
• macOS fixes (#20038, #21662)
• abstract spec comparisons (#20341)
• continuous integration (#17563)
• performance improvements for binary relocation (#19690, #20768)
• additional sanity checks for variants in builtin packages (#20373)
• do not pollute auto-generated configuration files with empty lists or
  dicts (#20526)

plus assorted documentation (#20021, #20174) and package bug fixes/enhancements
(#19617, #19933, #19986, #20006, #20097, #20198, #20794, #20906, #21411).