Fixed an issue in addImportDecl

[SAdams601]

When adding an import that only imports some names e.g.

import Data.List (head) 

When calling addImportDecl hide will be false but idNames would be non-empty. The output includes two spaces between the module name and the list of imported identifiers e.g.

import Data.List  (head)

I check if the import is hidden and if it's not remove the annotation for the hiding keyword and the DP for the open parenthesis becomes (0,0).

[SAdams601]

Also made it so that addImportDecl correctly handles qualified imports.

[alanz]

Sorry for the delay, been a busy week.