Position calculations in HsParser

[Anders Lau Olsen]

HsParser miscalculates column-positions if qualified names are used.
The problem seems to be the lexer forgetting to count the '.' in the
qualified name when deciding how much to move forward. In this
function, for instance,

    f M.A M.B M.C = 0
               ^

HsParser reports that the '=' is located at the column marked by the ^.

Anders Lau Olsen