At present these are
- log.conf
- config-user.scm (previously config.user-2.0)
Implement one-time migration of these files to the proper directory if they previously exist
Look for a log.conf file in gnc_userconfig_dir instead of gnc_userdata_dir
Note this commit also uses boost::locale::translate for the first time.
We may need to fine-tune our use, but in the current state strings marked
for translation using that function are already picked up for gnucash.pot.
