* include/Win_GParted.h,
src/Win_GParted.cc: First load gui and then scan devices, this resulted in way faster startup and is more satisfactory (imho)
Also did some minor code cleanups and rearranged some functions needed for applying operations.
* src/Dialog_Progress.cc: few minor code cleanups.
* include/Device.h,
src/Device.cc: made 'deep-scan' optional in Read_Disk_Layout. Removed obsolete (already) commented function.
* include/Partition.h,
src/Partition.cc: Took used sectors out of Set() and added a Set_Used() function instead. Also added Reset() .
* src/Dialog_Partition_New.cc: minor change to make use of the new Set() in Partition..
* include/Win_GParted.h,
src/Win_GParted.cc: show pulsing progressbar while refreshing devices.