Deprecate old InstallationController APIs

[Michael Baessler]

When looking at the InstallationController code I see some old method, 
where I think they are never used.

The InstallationController can be configured in two different ways to 
install a PEAR file.

The first way is to specify the PEAR file location with a target 
installation directory beside some other additional settings. I think 
this is the common way...

The second way is to specify only the PEAR file component ID with a 
target installation directory beside some other additional settings. 
When using this way the user will be asked either via command line or 
with a separate GUI to specify the path where the PEAR file with the 
specified component ID is located. I don't think that this API will be 
used by any user.

With the changes at the InstallationController for the "target 
installation directory cleanup" I don't want to update the additional 
parameters for both ways described above. I don't think that the second 
way is in use, so I want to deprecate it (or even better remove it 
completely ??).

What do others think about this? Does any know an user that use the 
second way?

-- Michael