Bug 19969

The current manner in which directories and JAR files are added to the NetBeans 
CLASSPATH can become a bit cluttered. That is, if there are 5 JAR files that 
are required for my application server plus 3 JAR files required by my database 
plus 4 JAR files required by my application, I will have a list of 12 JAR files 
in my list of mounted directories. I would like to propose adding the option of 
creating a collection or "Library" out of the JAR files and directories that 
must be included in the CLASSPATH. In this way, I could create an "App Server" 
library that included the 5 JAR files, a "Database" library that included 3 JAR 
files, and an "Application" library that included 4 JAR files. The list of 
mounted directories then would only show these three libraries rather than all 
12 JAR files. This "Library" approach provides a simple way to manage and 
categorize all CLASSPATH settings. JBuilder and JDeveloper use this approach.