I started to implement the drift correction.
I added plugins.config and an ant build file.
Some settings of the project have been changed to automatically use the
ant build file.
I implemented the new method showRoiDialog().
The new class ExtendedWaitForUserDialog is necessary to add an
additional button to the WaitForUserDialog that is provided by IJ.
The RoiDialog can be cancelled by pressing escape.
Added a new class for time measurements.
Added a normalised cross-correlation that will be used for automatic
drift detection.
Implemented the usage of NormCrossCorrelation.
Merge pull request #1 from EFTEMj/cc1

Cc1