add comex_user_shared.js for elements that will also be usefull in profile form, and continue refactoring (WIP)

tidy up pyservices: create a separate db module, restore re_hash in tools module (accidentally removed from main.py at 45803919), other minor bugfixes

use the same ENV => INI => default strategy for SQL_HOST in php that we have had for all config vars in py services

troubleshooting config via docker-compose volume (new logic for debug messages, run.sh reads ini file, but shell env vars get priority over config vars)

merged the two python services to run them together via run.sh and adapted the docs... this new version takes almost all functionalities from david chavalarias's and samuel castillo's work, cleaned up and integrated with the new registration service and a standard docker+nginx packaging for deployment

tidy up php scripts: 10 are used via include (=> moved to lib dir) while 5 are used for front end (search_* and print_*) => stay