[GRASS5] m.in.e00: raster import and ESRI NULL values

[Markus Neteler]

Dear developers,

a (not unknown) problem I have run into today: When importing
E00 raster data with m.in.e00, the module doesn't catch the
ESRI NULL value properly:

r.info wakedem30 
| Range of data:    min = -340282306073709652508363335590014353408.000000|

Some time ago, I have written details into
src/misc/m.in.e00/TODO:
such as
  GRD 2 meaning single precision float values, you have only 7 significant
  digits, so -0.3402823E+39 is a good value to use.

Unfortunately I don't get the change coded in C to read the actual
ESRI NULL value from the E00 file. The secrets are explained in
TODO, it would be great if someone could fix the problem.

Thanks!

 Markus