Provide Multuple Means of OLP Installation

[oubiwann]

Features:

• Generalize work done so far to be reusable by all install methods - Generalize install code to be reusable by all install methods #38
• Default install to /opt/olp - Provide a default install to /opt/olp #39
• Custom install to OLP_PREFIX (e,g., /usr/local/lib, ~/.local, etc.) - Provide a means of custom installs  #40
• Install to Docker image - Install OLP in a Docker image #41

Part of release #1