fixed Select.project method + minor refactoring of the columns of a Select query

Closes #23 (closed)

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assigned to @ncrosett

Je pense qu'il faut mettre column_origin dans un store. On veut pouvoir faire :

@table
class tbl:
    x: int
    y: str

q0 = tbl.select(aliases={1: "foo"})
q1 = q0.add_where(q0.column_origins.y.eq("bar"))

I suggest to define _init_columns of Select to set the column_origins (rather than the columns in the super-class Relation). That will make the code more understandable, I think.

needs black !

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• b5f6ac64 - added tests for some dql Select features, changed Select.column_origins to be a NamedStore

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• 0622e10c - _init_columns/__getstate__ of Select revisited

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mentioned in commit bf147c6b