update of new additions

updated CFD_collocated_c.ipynb

adding ...slot_jet... case; inlet at bottom, outlet at top; minimimal edits

adding file CFD_collocated_c, which is better than _b and is motivated by AME. The descriptions should now be consistent with the codes.

modifying the collocated code with new file CFD_collocated_b; SEE the NOTE before the code

cleanup the working versions; update method writeup for collocated

works; velocities are only needed at faces, everything is written in terms of those

minor edits to config

updates while looking for errors in collocated; fixing plotting issue on staggered

found a small bug on pressure indicies in driver; didnt fix issue; plotting to see issue better; u and v encroach on boundaries; uf, vf dont

works, but doenst give same results as staggered grid, and not as stable

finished, but need to debug

collocated: functions for H and P written; need to check on global vars

cfd_collocated

fixed math processing error