Roles/Database: better describe actions creating schema blocks
db_schemas: update checksums
db_tool: clarified log output message
INIFile: comparison of string values needs 'eq'
Timer: fix methodname for 'stop', fix returning timestamps

- Added log errors when 'stop' is called without 'start', and when the
  time value difference is asked for and either 'start' or 'stop' have
  not been called previously
wadindex: log the time required to generate checksums
idGamesFile: added WAD 'key' attribute

- 'key' is generated from base URL + path to file