ROSCO input file: write "PerfTableSize" without decimals

[Guiiem]

If I use ROSCODISCONFile.write() after reading a working DISCON.IN, the line of the performance table size is written as:

20.00000000000 20.00000000000    ! PerfTableSize     - Size of rotor performance tables, first number refers to number of blade pitch angles, second number referse to number of tip-speed ratios

Which can't be read by ROSCO (at least version 2.6.0) with error The "PerfTableSize" array was not assigned valid REAL values on line #90. I have just modified it to write it without decimals, so the result is the same as the original file:

20      20         ! PerfTableSize     - Size of rotor performance tables, first number refers to number of blade pitch angles, second number referse to number of tip-speed ratios

Now this can be read and the simulation runs :)

[ebranlard]

This looks good to me.