* gnu/packages/bioconductor.scm (r-scrnaseq): Update to 2.18.0. [propagated-inputs]: Add r-alabaster-base, r-alabaster-matrix, r-alabaster-sce, r-dbi, r-delayedarray, r-gypsum, r-jsonlite, r-matrix, r-rsqlite, and r-sparsearray. Change-Id: Ib72ccf01386df1bc464bea2922e4539968b97805