Adding evalcount with warning
Added the posibility to print the evaluation step count of the abstract machine. Also added a warning to REPL, to warn of long print times:
fang> fac 4;
24
fang> :smc
Machine Steps count: 345
fang> :smt
REPL-Warning: Machine Step count is 345. It is not recommended to print a trace over 200 length. Options (enter):
abort -> Aborts printing the Trace
cont -> Continues printing the Trace
last -> Prints the last Machine State
conflict> abort
fang>