fixed _dbSelect not detecting fields properly
Wrote getAdminUsers
Wrote getAdminUsers
getAdminUsers deals sensibly with mutliple users; _dbSelect() can deal with multi-dimensional equals array for #35
Added createAdmin user for #35
Added handling of extant users to createAdminUser()
Removed guesswork from _createDBI() for #39
Fixed a bunch of errors in  _createDBI() from last commit for #39
Revised comment to better match goal for #39
Removed GPG bits from constructor for #39
Merged in tidies for #39
_parseMysqlConfigFile() is no longer used as of #39
Stop dumping ->{'_postfixAdminConfig'} in the constructor