ability to take tfluct solver as input in solver
euler 1d example modified to use new solver tfluct workflow
added dimension dependenpt tfluct stub functions
changed amdq2 to adq in tfluct solver for Euler 1D
stub functions now are empty_tfluct at the top of sharpclaw solver.py
removed tfluct from src in Makefile
added documentation on attribute tfluct on sharpclaw/solver.py
empty_tfluct to default_tfluct, and summary of if statements inside default tfluct function
Clearer error message when tfluct is not set.
Merge pull request #424 from sanromd/dev-tfluct

tfluct as input to solver, following rp