Remove functions prettyInfoElem and prettyNoInfoElem
Add 'file name' parameter to functions renderWithDefMode and renderWithMode
Fixing 'instance PrettyAst Match' - 'seq' function isn't sutable here
Fix 'nest' function
'onsideNest' function is adaptation 'mySep' function from standart Pretty module
Fix several comments
Get rid of 'intersperse1' function
Fix 'onsideNest' usages in several cases