Smart quotes consider balanced quotes on current line. Closes #94.

test/autoclose_quotes.txt

@@ -38,3 +38,5 @@ set cpo=ces$
 "('test'x" "('test'x)"
 # Duplicate whole line when inserting quote at bol #105
 "}\<Home>'" "''}"
+"'\<Del>abc  '" "'abc  '"
+"''abc '" "''abc ''"

test/expand_cr.txt

@@ -48,7 +48,7 @@ sub foo {
 call setline(1, '"{bracketed}')
 normal A"x
 ================================================================================
-"{bracketed}"x"
+"{bracketed}"x
 --------------------------------------------------------------------------------
 # Syntax folding enabled by autocmd breaks expansion. But ti can't be tested
 # with :normal