- Added a getFileName() function, which calls the getFileName() of xExportManager
(which has been made const)

- Added an exportDebug function, to export values managers. In the future it could
eventually be overloaded to export other debug files. A good example could be
xCSRVector or matrixes, but it would introduced a dependency of xExport on xLinalg

- Added a debug flag with a setDebugFlag function to add some debug output

- Now the exportOnSpace functions automatically set the number of splits of the
xExport to 1 (similarly to the old MyExport function of DamageGrowthBase in TLSImplicit)