Reviewed the mainwindow.cpp and modified mainwindow.cpp and configurationform.cpp.
Merge pull request #155 from Bumanji/master

Minor changes on the mainwindow.cpp and configurationform.cpp
Removed "ConfigurationForm::" scope when reference the class constants
on restoreDefaults() method.
Fixed loading process for indexes.

Fixed issues related to GiST and index sorting (issue #156)

Fill factor now is optional (by default indexes are created with default
value = 90) (issue #157)
Complementary fix for issue #157. Need more tests!
Added GPL3 license declaration on .cpp files.
Fixed a misplaced conditional on Trigger::setFunction(). (issue #158)
Possible solution for printing crash. (issue #89)

Index FASTUPDATE and FILLFACTOR params is now activated according the
indexing type (issues #159)
Fixed translation bypassing on index edit form (issue #160)

Updated pt_BR translation.
Change on XML code generation. Empty tags that stores pure texts like
<comment> are now generated with a <![CDATA[]]> tag in order to cover
operators that can cause the generation of malformed XML.
Updated fr_FR translation