r49491: missing egw_customfield changed from last commit
r49492: fix formatting for timestamp and quiten error_log
r49493: class var to enable/disable memory_usage reporting to error_log
- Remove accidentally committed debug
- Make URL into web-accessable URL
- Add clickable link placeholder
- Format custom field date/times according to user preference
- Add rel_path placeholder, includes path+name relative to current directory