Add debugging info to LoginBrokerPanel
Logging: change some sysout statements to slf4j logging
Change debug message
Solve empty catch phrases and swollowing exceptions
Remove Version from submodule pom files and set version via the parent pom.

It was necessary to remove the connection related pcells files from the dcache
repo to make pcells work. Otherwise one gets an field access exceptions in the
Ssh2DomainConnection. This is because the DomainConnectionAdapter _out is loaded
through another class loader.
Add plugins files and change loading the URL to load from resource
Change version file in doc
Add bird images
Add error message when FlushManager does not exist in the addressed dCache instance
Fix poolManagerCellInfo.getPoolNames().toArray