org.gephi.visualization.text to publicPackage

Class TextModelImpl has some feature that is important e.x. setShowNodeLabels()

Duplicate statement in DirectoryChooserUI.java

Fix HITS algorithm and enable it back.

Fix #1466 No Suitable Driver Found for jdbc:postgresql

This failed https://travis-ci.org/gephi/gephi/builds/120065665

Fix #713 Modularity Calculation Throws Exception On Empty Graph

The `if` body is equivalent to the `else` body.

Add German as new language (Fix #1350)

Use AttributeUtils.print with configured time format and time zone in data laboratory where necessary.

* Use diamond inference where possible
* Reorganize imports
* Changed occurrences of String .indexOf() != -1 to .contains()
* Changed occurrences of List .size() == 0 to .isEmpty()

Done with Netbeans inspect and transform feature