unify the namespace
allow set and proof decl accept computation
merge tactic language into prog, and decided to not go with computing over formula
fixed the parser to handle let-bind and programmable tactic, need to test that though
fixed pp
done with parser test, so far so good
some changes
fix a parser bug
finishing evaluating proofs, next fix proofchecking and preprocess
fix a nasty bug in parser due to not using try.
incorported programmable tactic, now just need to test
need to fix a bug on determinating free variable ugh...
fix the nontermination issue, brilliantly.
now just need to test programmable tactic
add a test files
implement a full programmable tactic feature.