[PYTHON][TESTS][DOC] Various improvement of the API and code quality:

* Simplified `triton.kernel` API to achieve lower latency:
  > .data_ptr() must now be passed as kernel argument. No more implicit
conversion from torch.tensor
  > compilation options are now constant attributes, i.e., opt.d('VAR')
becomes opt.VAR
  > torch.device must now be passed explicitly to triton.kernel (no
longer inferred from torch.tensor arguments)
* C++ tests moved to `python/tests/`
* C++ tutorial created in `tutorials/`
* Python tutorial created in python/tutorials/
* Version changed to 1.0alpha
* No longer copying C++ headers into the Python package
* added python/triton/ops/ package for pre-written Triton ops

lib/lang/parser.cc

@@ -108,11 +108,9 @@ void Parser::ParseTranslationUnit() {
 
 FuncDef* Parser::ParseFuncDef(Identifier* ident) {
   auto funcDef = EnterFunc(ident);
-
   if (funcDef->FuncType()->Complete()) {
     Error(ident, "redefinition of '%s'", funcDef->Name().c_str());
   }
-
   // TODO(wgtdkp): param checking
   auto funcType = ident->Type()->ToFunc();
   funcType->SetComplete(true);