Auto add admin user when started without database file

added 15 commits

• 1997e5f7...38c34c62 - 13 commits from branch master
• fa64c85d - Implement macro with_conn! to obtain the db connection from mutex for as short as possible
• 0b3260ca - Add feature to reset admin pw with command line flag

Compare with previous version

merged

unmarked as a Work In Progress