Further restrict time monitor

[momchil-flex]

Some further restrictions or change of default settings for time monitors can be beneficial to avoid generating unintendedly large amount of data. Options to consider:

• Set recording interval > 1 by default.
• Warn or error if larger than some number of time steps present.
• Only apply the above for monitors larger than 0D.

@xin-flex any comments?

[momchil-flex]

Actually note that we already have this warning:

15:49:45 PST WARNING: The monitor 'interval' field was left as its default      
             value, which will set it to 1 internally. A value of 1 means that  
             the data will be sampled at every time step, which may potentially 
             produce more data than desired, depending on the use case. To      
             reduce data storage, one may downsample the data by setting        
             'interval > 1' or by choosing alternative 'start' and 'stop' values
             for the time sampling. If you intended to use the highest          
             resolution time sampling, you may suppress this warning by         
             explicitly setting 'interval=1' in the monitor. 

[xin-flex]

Thanks, Momchil! For 0D, let's have an error if larger than certain time steps.

[momchil-flex]

You mean for > 0D?

[xin-flex]

You mean for > 0D?

Yes :)