gnu, doc: Use HTTPS for cran.r-project.org home pages.
* gnu/packages/bioinformatics.scm (r-sparql, r-acsnminer, r-gkmsvm)
(r-maldiquant, r-gprofiler)[home-page]: Use HTTPS.
* gnu/packages/cran.scm (r-colorspace, r-auc, r-calibrate, r-shape)
(r-compare, r-proxy, r-sp, r-rmtstat, r-lmtest, r-inline, r-bbmle)
(r-lpsolve, r-energy, r-suppdists, r-ksamples, r-cvst, r-drr, r-prodlim)
(r-ddalpha, r-rcpproll, r-ipred, r-psych, r-truncnorm, r-rsolnp, r-laeken)
(r-vcd, r-ica, r-scatterplot3d)[home-page]: Likewise.
* gnu/packages/machine-learning.scm (r-adaptivesparsity, r-kernlab)
[home-page]: Likewise.
* gnu/packages/maths.scm (r-quadprog, r-pracma)[home-page]: Likewise.
* gnu/packages/statistics.scm (r-boot, r-cluster, r-codetools, r-foreign)
(r-kernsmooth, r-nlme, r-mgcv, r-rpart, r-dichromat, r-estimability)
(r-pheatmap, r-labeling, r-magrittr, r-munsell, r-rcolorbrewer, r-sendmailr)
(r-gdtools, r-acepack, r-formula, r-locfit, r-chron, r-coda, r-backports)
(r-brew, r-commonmark, r-rstudioapi, r-plotrix, r-gridbase, r-bitops)
(r-catools, r-xnomial, r-lambda-r, r-whoreadsthis, r-futile-options)
(r-futile-logger, r-segmented, r-snow, r-iterators, r-foreach, r-doparallel)
(r-domc, r-irlba, r-registry, r-e1071, r-bigmemory-sri, r-r-methodss3)
(r-tidyselect, r-base64, r-runit, r-sfsmisc, r-gtools, r-gdata, r-gplots)
(r-ztable, r-vipor, r-sourcetools, r-statmod, r-compquadform, r-mixtools)
(r-fastica, r-diptest, r-modeltools, r-flexmix, r-deoptimr, r-pcapp)
(r-rrcov, r-fit-models, r-robust, r-trimcluster, r-fpc, r-fnn)
(r-modelmetrics, r-nloptr, r-lme4, r-tclust, r-lubridate)[home-page]:
Likewise.
* gnu/packages/web.scm (r-htmltools, r-hwriter, r-rjson, r-rook)[home-page]:
Likewise.
* doc/guix.texi (Invoking guix import, Invoking guix refresh): Likewise.
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