Updating gitignore
Removing object files accidentally submitted
Merge remote-tracking branch 'refs/remotes/origin/master'
commiting minor changes to scripts before chaecking out
Modifying/simplifying predictor corrector scheme
Modifying/simplifying predictor corrector scheme
Removing abuse of call to v_total in Lubrication (v_total should be a private variable for the system class). Changed to safer call to velocity.
Updating Makefiel
Modifying makefile
Reverting to v_total in Lubrication, because v_total = velocity-v_inf. Looking for a better solution
Relabeling velocities in the System class
Makefile uses clang on MacOS
Merging in dev branch: now mid-point algorithm is brushed and works.
Brownian forces come back!

Well, almost. We are at the point where things are gramatically correct
(it compiles), which does not mean they make sense :)

Done:
- reintroduced the part of the code dealing with Brownian motion (only the
dynamics part, not the stress computation part).
- made this code compatible and compiling with current code.

To be done:
- correct wiring to the rest of the code. things are compiling at this point, but no more. Don't
  expect all necessary variables to be set right.
- every testing, even basic
- incorporate this part better in overall code. For instance there's no
  Peclet number at this stage
- incorporate back the Brownian stress computations
Modifying Makefile to allow 'make debug'.
Removing seg faults in Brownian motion
Corrected comments for the stress calculations.
Merge remote-tracking branch 'refs/remotes/origin/dev' into dev
.
Bug Fix in the computation of velocities in the Brownian time evolution