read_netcdf

'read_netcdf': reads a list of fields and constants in a netcdf file
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[cte_detect,var_detect,cte_read,var_read,choice,cte2_detect,var2_detect,cte2_read,var2_read]=...
 read_netcdf(filename,cte1,nb1,var1,cte2,nb2,var2,option)
OUTPUT:
cte_detect: array with the dimension of cte1 or cte2 (option 'or'), =1 if the constant is detected 0 else.
var_detect: like cte_detect for the variables
cte_read: list of the values for the constants (global attributes), =0 if not detected
var_read(ind,:): variable array number ind, the variable #i is determined as var_read(ind(i),:), with ind=cumsum(var_detect);
choice=1 if the first list is chosen (or with the option 'and'), 2 else.
cte2_detect,var2_detect, cte2_read,var2_read, second set of v ctes and variables (only with the option 'and')

INPUT:
filename (netcdf file)
cte1: cell array listing the constants (global attributes) to read
nb1: name (string) of the constant in the netcdf file giving the length of var1 (if absent no variable is read)
var1: list of variables arrays to read with length nb1
cte2,nb2,var2: second list of cte and variables (optional)
option: 
'first' read only the first field series (default)
'or' : read one of them, the first one in priority if it exists
'and' : read the two field series

 related FUNCTION 
 'varname_generator.m': generates the appropriate list of variables and constants