Improve the course on libraries

[OlegKunitsyn]

• What is the standard structure of the exportable source-code library?
• How the libraries are usually managed?
• How the libraries are usually integrated into the programs?
• What is the standard application-level package manager (e.g. Maven, NuGet)?

[OlegKunitsyn]

Two years later I came to the conclusion that openness was never a value here. The article Enterprise COBOL: Package Tutorial is still counting reads but only one person tried the package manager so far.