C flag fix and comments
Created by: dyang37
This PR contains multiple things:
- Changed flag of prox_mode from float to char, and modified icd update rule as proposed and discussed in issue #64 .
- Changed flag of positivity from int to char.
- In C code, replaced all tabs with four spaces.
- In C code, added comments to recon() function in interface.c.
Tested by running demp_mace3D_old.py. The results of both mace3D and qGGMRF recon are visually the same as before.