Release 12.1.5

This release contains a variety of fixes from 12.1.4-1. For information about new features in major release 12, see Release 12.1.0.

A dump/restore is not required for those running 12.1.X.

• Remove the dependency of the Debian software package on postgresql-common and postgresql-client-common.
• Adjust the installation on Debian system, detach the database initialization steps, and perform them separately after the user installs the program.
• Adjust the installation directory on Debian system and install the main program files to the path /usr/pgsql-12.
• Integrate plugins into Windows software package.
• Release the software package that supports the Ubuntu system.
• Release the generic binary package that supports the Linux platform.