Use HTTPS for bioconductor.org.

* doc/guix.texi (Invoking guix import, Invoking guix refresh): Use HTTPS for
bioconductor.org URLs.
* gnu/packages/bioinformatics.scm (r-annotate, r-geneplotter, r-genefilter)
(r-deseq2, r-dexseq, r-annotationforge, r-rbgl, r-gseabase, r-category)
(r-gostats, r-shortread, r-biocgenerics, r-biocinstaller, r-biocviews)
(r-biocstyle, r-bioccheck, r-s4vectors, r-iranges, r-genomeinfodbdata)
(r-genomeinfodb, r-xvector, r-genomicranges, r-biobase, r-annotationdbi)
(r-biomart, r-biocparallel, r-biostrings, r-rsamtools, r-delayedarray)
(r-summarizedexperiment, r-genomicalignments, r-rtracklayer)
(r-genomicfeatures, r-graph, r-topgo, r-bsgenome, r-impute, r-seqpattern)
(r-seqlogo, r-motifrg, r-bamsignals, r-mutationalpatterns, r-tximport)
(r-rhdf5, r-chipseq, r-sva, r-affy, r-vsn, r-mzid, r-msnid)
(r-interactivedisplaybase, r-annotationhub)[home-page]: Likewise.
* gnu/packages/bioinformatics.scm (r-txdb-hsapiens-ucsc-hg19-knowngene)
(r-go-db, r-bsgenome-hsapiens-1000genomes-hs37d5, r-org-hs-eg-db)
(r-org-ce-eg-db, r-org-dm-eg-db, r-org-mm-eg-db)
(r-bsgenome-hsapiens-ucsc-hg19, r-bsgenome-mmusculus-ucsc-mm9)
(r-bsgenome-mmusculus-ucsc-mm10, r-txdb-mmusculus-ucsc-mm10-knowngene)
(r-bsgenome-celegans-ucsc-ce6, r-bsgenome-celegans-ucsc-ce10)
(r-bsgenome-dmelanogaster-ucsc-dm3, r-copyhelper)[source, home-page]:
Likewise.
* gnu/packages/statistics.scm (r-rcurl)[source]: Likewise.
* guix/build-system/r.scm (bioconductor-uri): Likewise.
* guix/import/cran.scm (%cran-url, bioconductor-package?)
(bioconductor-data-package?, bioconductor-experiment-package?): Likewise.

gnu: r-tidyr: Update to 0.7.2.

* gnu/packages/statistics.scm (r-tidyr): Update to 0.7.2.

gnu: r-tidyselect: Update to 0.2.2.

* gnu/packages/statistics.scm (r-tidyselect): Update to 0.2.2.

gnu: r-rcpparmadillo: Update to 0.8.100.1.0.

* gnu/packages/statistics.scm (r-rcpparmadillo): Update to 0.8.100.1.0.
[native-inputs]: Add r-knitr.

gnu: r-data-table: Update to 1.10.4-2.

* gnu/packages/statistics.scm (r-data-table): Update to 1.10.4-2.

gnu: r-chron: Update to 2.3-51.

* gnu/packages/statistics.scm (r-chron): Update to 2.3-51.

gnu: r-dplyr: Update to 0.7.4.

* gnu/packages/statistics.scm (r-dplyr): Update to 0.7.4.

gnu: Add r-ggdendro.

* gnu/packages/statistics.scm (r-ggdendro): New variable.

Merge branch 'master' into staging

gnu: r-lme4: Update to 1.1-14.

* gnu/packages/statistics.scm (r-lme4): Update to 1.1-14.

gnu: r-doparallel: Update to 1.0.11.

* gnu/packages/statistics.scm (r-doparallel): Update to 1.0.11.

gnu: r-checkmate: Update to 1.8.4.

* gnu/packages/statistics.scm (r-checkmate): Update to 1.8.4.

gnu: r-backports: Update to 1.1.1.

* gnu/packages/statistics.scm (r-backports): Update to 1.1.1.

gnu: r-minimal: Update to 3.4.2.

* gnu/packages/statistics.scm (r-minimal): Update to 3.4.2.

Merge branch 'master' into staging

gnu: r-glmnet: Update to 2.0-13.

* gnu/packages/statistics.scm (r-glmnet): Update to 2.0-13.

gnu: r-segmented: Update to 0.5-2.2.

* gnu/packages/statistics.scm (r-segmented): Update to 0.5-2.2.

gnu: r-mgcv: Update to 1.8-22.

* gnu/packages/statistics.scm (r-mgcv): Update to 1.8-22.

Merge branch 'master' into staging

gnu: r-glmnet: Update to 2.0-12.

* gnu/packages/statistics.scm (r-glmnet): Update to 2.0-12.