Quote possibly empty variable to avoid error message

Error message encountered on RH5 when building out-of-source:
CMake Error at CMakeLists.txt:90 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Set model type to debug

Revert this commit when done debugging
Adds input files for tiny model in hexadecimal (1 byte) format

Files are created by the command:

od -v -t x1 foo.grdecl | sed \
's/^[0-9A-Fa-f]\{1,\} *//
/^ *$/d
s/ \{1,\}/,0x/g
s/^/0x/
s/$/,/' > foo.dat
Take hexedecimal files as input for tiny model

Don't take long string objects as input, but use the generated
hexadecimal files instead. This will remove compiler warnings
about long strings.

Also change the way stringstream objects are generated, as data
types are changed from string to char.

Similar changes should be done to the other models later.
Don't use .eof() as stopping criteria for while loop

This caused infinite loops
Change the way resultString is read to ignore lines starting with '#'
Take hexadecimal files as input for benchmark models

Similar commit as 22199133d6
Remove old input files

These are not used anymore as we include hexadecimal files instead.
Remove largest model as this takes to much memory

When using hexadecimal file formats, the memory is about 5 times doubled.
Add new script file that create hexadecimal input data files

Remove old script based on declaring large strings
Set small model to default
Merge pull request #15 from laods/embed_od

Embed hexadecimal input data instead of strings