Add log path to config file

[kfriede]

If users want to put backups and scripts in location other than /snapshots/, they need to modify the script to change the location of the log file. This should be read from the config so that only the config needs to be modified.

[NAUbackup]

It could be possibly made a global variable, but you could also just create a pointer from /snapshots to a selected directory of your choice. That would be much simpler, at least for now.

[rudolfmayer]

I support that request; incidentally, doing a symlink was also what I did, but I'd prefer a global variable

[NAUbackup]

Duly noted, thank you!