Add patterns to the output file name.

- Add patterns to create the output file name from different parts of the input file names: the directory,
  the base name, the base name without the extension and the numeral suffix.
Add batch mode

- Add an option to enable batch mode in command line and to control the batch gap.
- Add the getBracketedSets method to Launcher to calculate the sets of bracketed images in batch mode.
- Then, automaticMerge method iterates on each set of images.
- Add a description to each new option.
- Add msgN method to Log, to print a line of text without the final carriage return.
Fixes and refactorings

- Fix the batch mode stoping when an image fails. Now it jumps to the next set.
- Add Log::debug and Log::progress convenient methods.
Add translations and fix Exif tags.

- Add translations for help text.
- Fix copying Exif.Image.Artist and Exif.Image.Copyright tags from input files to output.