New wrapper functions introduced, some one-line parameter monsters killed:

New wrapper functions introduced, some one-line parameter monsters killed:
- New function addDropTableSql introduced which wraps a DROP TABLE statement
- New (cached) function isSqlTableCreated introduced which checks if the given
  table is created
- New (cached) function isSqlTableIndexAdded introduced which checks on a 'mode'
  condition (see source code) if the table index is created
- In two admin what-modules there was a one/multi-line parameter monster which
  is now dead and resurrected as a human-readable multi-line creature ... ;-)
- TODOs.txt updated