Add: PSeq to coalton library

Defining a few insances

into instance from foldables

Pseq in asd

Note about shifting capacity in rebalance-branches

Add Pseq tests

Fixed CST-SEARCH to accomodate arbitrary MIN-BRANCHING

Following Bagwell's presentation, while building I used a minimum
branching factor that was one less than the max-branching factor.
This guaranteed that the initial guess cumulative size table index for
an array index was at most 1 off from the real location.

Using different bounds requires a linear search from the guess up to
the real location.

Add: test branching invariants

Add Eq to Pseq

Fix Eq for PSeq

Add test not equal

compile-when all the situations for match1 macro

Removed unused functions

cleanup

Add Monoid instance for PSeq

Add Pseq to Docgen

coalton.asd

@@ -176,6 +176,7 @@
                (:file "ord-tree")
                (:file "ord-map")
                (:file "monad/free")
+               (:file "pseq")
                (:file "system")
                (:file "prelude")))
 
@@ -315,5 +316,6 @@
                (:file "class-tests")
                (:file "list-tests")
                (:file "red-black-tests")
+               (:file "pseq-tests")
                (:file "unused-variables")
                (:file "pattern-matching-tests")))