Added silence_print to utils.misc
Forgot to add flux control coefficients to the substitution dictionary: fixed.
Fixed _exprassions.py: 'J' + reaction to 'J_' + reaction in line 54
First commit for ratechar and plotting modules. While this is the first commit, it represents almost all my work over the last month. +-1300 LOC
Deleted redundant files (ratechar.py, misc.py)