This removes the need to use the `-ffree-line-length-none`
 flag with gfortran

- Allows for optional arguments
- Fixes how jagged arrays are dereferenced

do not use setup.py to build wheel

Closes #2061

See merge request gmsh/gmsh!472

python package is installed via make; make install (i.e without wheel)

precompute entity bounding boxes when saving partitions in separate fiels (we write the full brep in each file, so otherwise we end up computing the bounding boxes as many times as we have partitions)

multiply NumSubEdges by number of poles for splines, which makes the occ drawing code behave more like the geo drawing code (cf. #2051)

build a single compound shape before copy(), so that we won't duplicate internal boundaries - cf. #2000)

Also removes resolved TODOs and removes usage of target where not needed

- You can use Fortran arrays as inputs, which are internally converted to C ptrs
- You can input normal Fortran strings which are internally converted to C strs
- You don't have to pass the size as an argument
- Return arrays are now Fortran allocatables arrays
- Jagged arrays are inserted/output as a single array and an array with the lengths of each dimension as opposed to cptr, cptr, size_n
- Pairs are now a (1:2,n) array that is cast into an assumed shape array in C
- `intent` keywords have been added to most variable types
- Had to create a dummy modue `fsize_m` to prevent the intrinsic `size()` being shadowed by any potential variables being named `size`

NOTES:
1. All the memory allocations in C need to be freed with a C callback otherwise we are leaking memory
2.

TODO List:
1. Add intent(out) for oint, osize, odouble
2. Add optional arguments for ierr
3. Add more generic optional arguments see Python
4. Allow for already allocated arrays to be deallocated internally

- new optional arguments to occ/addThruSections (#1976)