Production-relase v1.1.1

This is a new release with some changes under the bonnet and some new features:

Started to include Apptainer in the mix
CentOS-8 removed as End Of Life
EasyBuild bumped to version 4.5.3 as version 4.5.2 had an issue
some minor tidying up of the code.
Please note: We still found some issues for Rocky-8 and `envmod` for Singularity 3.8.x.
For that reason, we currently suggest to use the 3.7.x branch instead until we hopefully 
sorted the problem out in the next release.

Production-relase v1.1.0

This is a new release with some changes under the bonnet and some new features:

• Rocky-8 added
• CentOS-8 added
• EasyBuild bumped to version 4.5.0
• Python rich package added to utilize the progress bars in EasyBuild.
• Missing USER environment variable added
• some minor tidying up of the code.
  Please note: It looks like Singularity 3.8.x changed the way some environment variables are added. For that reason, we currently suggest to use the 3.7.x branch instead until we hopefully sorted the problem out in the next release.

Production-relase v1.0.2

• upgrade to EasyBuild 4.4.2
• Fixed broken script installation to ~/bin
• README updated to reflect new EasyBuild version
• Patch for enviornment-module removed for newer distributions as no longer needed
• EasyBuild installation updated to python3 -m pip install ...

Production-relase v1.0.1

• EasyBuild version updated to 4.4.1
• README.md upated
• Minor typos edited in text

Initial production-relase

This is a complete overhaul of the previous release:

• reducing the number of files by using templates for reoccurring code
• adding CentOS 8
• adding Debian 11 (Bullseye)
• new: adding Ubuntu 20.04 (Focal)
• new: adding automatic building of containers (requires fakeroot)
• new: adding installation script
• new: fixing used EasyBuild to version 4.4.0
• improvement: command line takes now all arguments so it can be used within a script
• several bug fixes and tidy up the code
• adding used EasyBuild version and EasyConfig file used to the container information (requires Singularity 3.7.x or higher)
• tested with Singularity 3.7.1

Initial release

Initial release which contains:

• set of bash scripts to create simple Singularity Definition Files
• set of Singularity Definition Files created with above script
• supported Singularity OS containers: Debian 9, Debian 10, CentOS7
• supported Singularity Python OS inside container: Python version 2.x and 3.x (installed per default by the OS)
• Copyright of the project