minor edits to run lazywrf.py

1. line 76, from ```int_prefix = "FILE"``` to ```int_prefix = "'FILE'"```, to avoid this error ``` At line 98 of file gridinfo_module.f90 (unit = 10, file = 'namelist.wps')
Fortran runtime error: Cannot match namelist object name file```
1.  line 104, def edit_namelist_input was maintained as of WPS namelist edit function, other wise the namelist.input was edited mistakenly.
1.  line 208 was edited to consider the better file copying convention
1.  line 238 and 239 are edited to correct multiplication of values avoid repetition as of python convention while multiply with integer and string
1.  line 265 was added to give the current directory necessary for wrf executables
1.  line 267 was edited as of point 3
1.  line 310 for remove comma after max_dom single variable entry
1.  line 325 and 331 was edited to run the script in normal Linux environment