Update 2.5.2

+ New option in GPS synchronization dialog by using synchronization time offset after selecting a trackpoint and a reference image
+ New option in GPS synchronization dialog for synchronizing with all track files in current directory
+ Renaming of track files
+ Reading *.nma track files
* Ignoring invalid track points in NMEA track files
! Save button was sometimes deactivated when using file filter
! Fixed problem with GeoSetter ShellExtension and Windows XP SP2