Add sufficient expressions to be useful

[Zulu-Inuoe]

More to be added as necessary:

• aggregate
• aggregate*
• all
• any
• any*
• eappend
• concat
• consume
• contains
• ecount
• ecount*
• default-if-empty
• distinct
• element-at
• evaluate
• except
• efirst
• efirst*
• group-by
• intersect
• elast
• elast*
• order-by
• prepend
• reverse
• select
• select*
• select-many
• select-many*
• single
• single*
• skip
• skip-last
• skip-until
• skip-while
• take
• take-every
• take-last
• take-until
• take-while
• where
• to-list
• to-vector