Author:  Mikhail Bulychev

Function:
    
    The program monitors and records the margin level at the moment
    of concluding trades for a group of clients.

How to use:

    In the following rows:
	client_list = "xxx,yyy,zzz"
	firm_id="firm_id"
        filename="margin_level.txt"
   set a list of clients to control margin, the firm identifier and name of file where 
   the record is stored.