Bump version of R packages

chore: Replace ADD with COPY

Fix ssh deploy key format

New Docker Hub UI loses newlines in the env
var settings. Loss of new lines leads ssh-add
to prompt and fail when loading the key.

Base64 encode and decode the key to workaround
the limitation.

Fall back on symlink if mv fails

bump version numbers and add periods before *

Signed-off-by: Greg <werner.greg@gmail.com>

install pip explicitly

it should be there automatically, but no harm in being explicit

scipy-notebook: update bokeh

Bump Ubuntu 18.04 to latest build

Bump: notebook (6.0.0 > 6.0.2), jupyterhub (1.0.0 > 1.1.0), jupyterlab (1.2.1 > 1.2.5).

instructions for python 3.x kernels with conda

scipy-notebook: update dask and h5py

Fix issue template typo

Update to Julia 1.3.0

Modify the way to change user uid/gid

Updated Julia version number and checksum to have Julia 1.3.1 be installed instead of 1.2.0.

Updated the install commands for Julia to use version 1.3.1 instead of 1.2.0

this was surprisingly hard to find help for online that was up-to-date and worked with the stacks, contributing here in hopes it'll help others.

Update ubuntu base image.

Twistlock vulnerability scanning showed OS issues removable by upgrading of package versions.

Configure Python Version with Build Arg

Add sudo recipe