Name stitcher.log with timestamp

[innnkkki]

Name the stitcher.log with the timestamp so it is easier to tell which is which

Imported from trac ticket #789, created by nriga on 03-16-2015 at 11:48, last modified: 03-16-2015 at 11:48

[ahelsing]

Tom suggests that stitcher should behave as many other programs do: if you download a file in your browser and the suggested filename is taken, it adds a number to the end and renames the new file.

Additionally, this renaming would handle the rename problem (#824).

Logs could be named something like stitcher-YYYYMMDDHH24MI.log.

Documentation would have to be updated to help experimenters find the appropriate log file.