Added some, but not all, code for the future CIFTI Parcel Label File.  (WB-392).
Removed an unused attribute from DataFileTypeEnum
There are virtual methods (setModified, clearModified, and isModified) in both Files/CaretMappableDataFile and FilesBase/VolumeBase.  VolumeFile inherits from both these classes and but does not implement isModified().  Everything has been okay until I added some standard template code that called isModified() and that caused a compiler error about isModified being in two base classes and it did not know which one to use.  Implementing isModified() in VolumeFile would probably have fixed the problem but, after thinking about it, I decided that having identically named methods in two super classes is probably not a good idea.  So, the methods in VolumeBase were renamed to setModifiedVolumeBase, clearModifiedVolumeBase, and isModifiedVolumeBase.
Implementing WB-421 but still a work in progress.
Moved DataFileTypeEnum to Common so that it can be used by FileInformation so that FileInformation::getFileExtension() returns the correct extension for Workbench data files that use extensions containing a dot.
Continuing WB-421 added duplicate file name logic to surface based files (surface, metric, label, rgba).
Resolve WB-421 Removed Files Remain Persistant in Manage Loaded Files Dialog: The problem was caused by having multiple files of the same type with the same name.  This could occur using the File Menu->Open Data File Dialog.  Now, when a file of a particular data type is loaded, Workbench will check to see if a file with the same data type and name is currently loaded.  If so, Workbench will alter the name of the file being loaded so that it is different than the name of any other files of the same type.  The name of the file is altered by inserting an underscore followed by a number immediately before the file extension's dot.  For example if the file melodic_IC.dscalar.nii is loaded and the user opens the same file with the File Open Dialog, the second instance of this file in memory will be renamed to melodic_IC_1.dscalar.nii.  By altering the filenames of duplicate files, it should also make it easier for the user to distinguish the duplicate flies in the user-interface such as the overlay selection.
Had to recommit some changed files after pulling from repository ????