preql-0.5: safe PostgreSQL queries using Quasiquoters

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<$Preql.Imports
<$!>Preql.Imports
<$>Preql.Imports
<&>Preql.Imports
<*Preql.Imports
<**>Preql.Imports
<*>Preql.Imports
<=<Preql.Imports
<|>Preql.Imports