SP-80, BIS-55: Feature of deselecting databases to be backuped implemented.

installation/resource/installer/backup-installation.xml

installation/resource/installer/bin/backup-databases.sh

installation/resource/installer/bin/backup-installation.sh

installation/resource/installer/bin/common-functions.sh

...lation/resource/installer/bin/database-existence-check.sh

installation/resource/installer/install.xml

installation/resource/installer/userInputSpec.xml

...cisd/openbis/installer/izpack/AbstractScriptExecutor.java

...sx/cisd/openbis/installer/izpack/ExecuteBackupAction.java

...d/openbis/installer/izpack/GlobalInstallationContext.java

...ystemsx/cisd/openbis/installer/izpack/JarClassLoader.java

.../openbis/installer/izpack/SetDatabasesToBackupAction.java