Release Windows build with debug info : add /opt:ref

to eliminate functions that are never referenced
Coroutines notes updated.
Updates internal notes
Under Linux, address bash is delegated to system()...
...which I consider to be a bug, because system() delegates to bin/sh.
Under Ubuntu, that breaks the readline procedure of ooRexxShell which depends on set -o history, not supported by sh.
Fixed by calling system() when address is "sh" instead of "bash".

Some notes about the implementation of address have been added.
Use the current git branch to name the build directory.

Since I started to create branches for the new functionalities, I prefer to have a separate build directory for each branch. For the moment, only Windows is enhanced, but Linux/MacOs will follow soon.
Examples of naming convention :
Win32Dbg-master
Win64Rel-operators
where 'master' and 'operators' are the branch name.
Merge branch 'master'