Misc fixes and improvements to DatabaseBackup and DatabaseIntegrityCheck

[olahallengren]

• Add new parameter @MinDatabaseSizeForDifferentialBackup to DatabaseBackup

This will perform a differential backup for databases 1024 MB or larger and skip databases smaller than this size.

EXECUTE dbo.DatabaseBackup
@Databases = 'USER_DATABASES',
@Directory = 'C:\Backup',
@BackupType = 'DIFF',
@ChangeBackupType = 'N',
@MinDatabaseSizeForDifferentialBackup = 1024

This will perform a differential backup for databases 1024 MB or larger and a full backup for databases smaller than this size.

EXECUTE dbo.DatabaseBackup
@Databases = 'USER_DATABASES',
@Directory = 'C:\Backup',
@BackupType = 'DIFF',
@ChangeBackupType = 'Y',
@MinDatabaseSizeForDifferentialBackup = 1024

• Optimize performance in DatabaseBackup for large number of databases
• Add new parameter @NoInformationalMessages to DatabaseIntegrityCheck
• Add support for new token Weekday for directory structure and file name
• Add support for cleanup, when the BackupType is not in the directory structure
• Add a check to determine if a full or differential backup is in progress before promoting a log backup
• Add support for specifying a backup set name
• Add support for backup set name as a token in directory structure and file name