Update docs with samtools: error while loading shared libraries: libcrypto.so.1.0.0 fix

[mikej888]

When deploying RiboViz within a new CentOS 7 (2009) VM I did:

$ conda install -y -c bioconda samtools
$ samtools --version
samtools: error while loading shared libraries: libcrypto.so.1.0.0: cannot open shared object file: No such file or directory
$ conda list | grep -in sam
65:pysam                     0.15.3           py37hda2845c_1    bioconda
73:samtools                  1.7                           1    bioconda

Googling revealed the link merenlab/anvio#1479. I tried the fix:

$ conda install -c bioconda samtools=1.9 --force-reinstall
$ samtools --version
samtools 1.9

and it works. This is the same issue that @canuse documented for #271, So this is not a Ubuntu-specific issue.

docs/user/install.md should be updated with this fix.

[mikej888]

As of commit ce28de4, develop now has docs/user/install.md with the above update.

[mikej888]

As of commit 4408f56, develop now has docs/user/install.md with use of conda install -y -c bioconda samtools=1.9 by default to avoid need for having to apply troubleshooting.