Options attribute type in SevHist objects.

• SevHist

 Time storage format is Posix Time.
 If this bit in not set, the storage format is Sql time.
 The sql time is displayed by sql as a readable time, while the posix time is
 displayed as the elapsed time since 1970-01-01 in seconds.
 In Mysql the size for Posix time is 4 bytes and the size for sql time 8 bytes.
 The resolution is 1 second. If higher resulution in needed, use the
 HighTimeResoution bit.

 HighTimeResolution increases the time resolution from seconds to nanoseconds.
 An additional nono second variable is stored with the size 4 bytes.

 The ReadOptimized bit will store an additional id value for each value
 which decreases the time to read data. The size of the id variable is
 4 bytes, if the HighTimeResolution bit is set the size is 8 bytes.

 The deadband is a range around the last stored value, where no new values
 will be stored, i.e a value has to differ more than the deadband/2 from
 the last stored value to be stored.
 Set the UseDeadBand bit to activate the deadband function. Note that the value
 of the deadband also has to be set in the DeadBand Attribute of the SevHist object.

 UseDeadBand will increase the storage size with 1 byte. The ReadOptimized bit
 also has to be set.

 Deadband calculated with linear regression of last points.

 Store a mean value calculated with linear regression.

 Not yet implemented.

 Event controlled storage. The attribute will only be stored
 one time when the trigger is activated.

 Calculate mean value with interval 1.

 Calculate mean value with interval 2.

 Float identity.