[Scaladoc] Improve the documentation of primary...

[Scaladoc] Improve the documentation of primary constructor. Adds a
@constructor for commenting the primary constructor. It also adds some
comments for the primary constructor (@params, @deprecated) which
are initialised in the class comment. Members that come from primary
constructor parameters (val parameters or parameters of a case class)
are listed as members with the comment given using the @param tag
(closes #254, closes #577). Case class signature now begins by 'case
class' instead of 'class'. Review by dubochet

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