Stop compiling f90 on the fly in pre-processing

[dc2917]

The script write_inputs.m currently compiles some fortran utilities (WriteIBMfiles, Matchfacetstocells, ...(?)) on the fly. This should instead be performed as part of the build process (e.g. user runs make tools), and the binaries are then stored in u-dales/tools/.

For example, in tools/IBM/writeIBMfiles:

if lmypolyfortran
    disp('Determining fluid/solid points using Fortran.')
    % Compile
    n_threads = 8;
    in_mypoly_fortran_path = [folder '/in_mypoly_fortran/'];
    addpath(in_mypoly_fortran_path)
    cd(in_mypoly_fortran_path);
    system('gfortran -O2 -fopenmp in_mypoly_functions.f90 ibm_necessary_functions.f90 IBM_flagging.f90 -o pre.exe');
    copyfile('pre.exe', fpath)
    delete pre.exe in_mypoly_functions.mod ibm_necessary_functions.mod
    ...
    cd(fpath)
    if lwindows
        system('pre.exe');
    else
        system('./pre.exe');
    end
    delete pre.exe inmypoly_inp_info.txt faces.txt vertices.txt zfgrid.txt zhgrid.txt;
    cd(currentPath)

Compiling pre.exe can be done via CMake, such that there exists an appropriately named executable (e.g. mypoly_fortran?) in tools/IBM/in_mypoly_fortran/.