- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* r-a4: Add r dependency and update url.
* r-a4base: Add r dependency and update url.
* r-a4classif: update url and add r dependency.
* r-a4core: Update url and add r dependency.
* r-a4preproc: Update url and add r dependency.
* r-a4reporting: Update url and add r dependency.
* r-abaenrichment: Update url and add r dependency.
* r-absseq: Update url and add r dependency.
* r-acgh: Update url and add r dependency.
* r-acme: Update url and add r dependency.
* r-adsplit: Update url and add r dependency.
* r-affxparser: Update url and add r dependency.
* r-affycomp: Update url and add r dependency.
* r-affycompatible: Update url and add r dependency.
* r-affycontam: Update url and add r dependency.
* r-annaffy: Update url and add r dependency.
* r-annotate: Update url and add r dependency.
* r-annotate: Update url and add r dependency.
* r-annotationdbi: Update url and add r dependency.
* r-genefilter: Update url and add r dependency.
* r-mlinterfaces: Update url and add r dependency.
* r-limma: Update url and add r dependency.
* r-multtest: Update url and add r dependency.
* r-a4classif: Correct format.
* r-affycomp: Correct error.
