Added reynolds number and better spacing for r

linspace didn't work for r.
had to add a phi-vector
added new terms to first calc. others aren't done
new file with different F_c, F_z

added all the corrections
Added Patrik's corrections
just a comment
new file with lots of changes...

got a new file, can't list all the changes
solved the problem with the radius at the center
Added functions for jm  and  jp
forgot some : ...
added some structure and comments
renamed pres_max_new and added new file

New file for pressure regulation without grad(div(u))
changed from grad(div(u)) to div(u)