Add notification email script to the freezing code.

[SimonGoring]

Need to split up the freezing, so that for each dataset added there is an email that goes out through the SMTP server.

[SimonGoring]

Note that this required the use of the mailR package, which also required the addition of rJava.

rJava requires the use of the Java-sdk. Instructions here: https://www.r-bloggers.com/installing-rjava-on-ubuntu/

One point was that both packages needed to be installed by the superuser, otherwise installation fails.

[SimonGoring]

Hmm, installed it with sudo, but cannot run it in R without sudo. . .

Trying this: https://anhqle.github.io/rstudio-cannot-load-rjava-in-ubuntu/

[SimonGoring]

Seems that the mail program for centOS is going to provide the most useful interaction. Will set this up as a bash script from my account.