move backlog stuff out

lib/Dan.rakumod

@@ -2,81 +2,7 @@ unit module Dan:ver<0.0.1>:auth<Steve Roe (p6steve@furnival.net)>;
 
 use Text::Table::Simple;
 
-#`[
-Todos
-- slice
-- nd indexing
-- dtype (manual/auto)
-- map
-- pipe
-- hyper
-- operators
-- df.T (transpose)
-- df.series
-- df.dtypes (dynamic)
-- df.sort
-- df.grep
-- df.describe
-- META6.json with deps
-
-v1 Backlog
-- Dan::Pandas spike 
-- Array MACs 
--- ix,cx (for reindex)
--- splice (for drop, assign, append, push, pop, shift, unshift)
-- Missing data
--- fillna, dropna, dropem
-- Concat 
--- concat (for join [outer|inner|left|right], merge)
-- Shape (just simple)
-^^^ done
-
-v2 Backlog 
-(much of this is test / synopsis examples / new mezzanine methods)
-- Set style ops
--- expose series eg. df.A, etc
--- see notes
-- Combine
--- .splice ok
-- Apply?
--- .map ok 
-- Duplicate labels?
--- don't support, need to detect and error
-- Index alignment?
--- just an outer concat with fillna
-- String ops?
--- .map ok (regex example)
-- Merge & Join?
--- .concat ok
-- Column sort
--- splice ok
-- Exceptions
-- Stats
-- Histogramming
-- SQL style ops
--- Group by
-- Reshaping (stacking)
-- Pivot tables
-- Time Series
-- Categoricals (Enums)
-- Plotting
-
-Operations
-df2.A                  df2.bool
-df2.abs                df2.boxplot
-df2.add                df2.C
-df2.add_prefix         df2.clip
-df2.add_suffix         df2.columns
-df2.align              df2.copy
-df2.all                df2.count
-df2.any                df2.combine
-df2.append             df2.D
-df2.apply              df2.describe
-df2.applymap           df2.diff
-df2.B                  df2.duplicated
-#]
-
-# helper declarations & functions
+### Declarations & Helper Functions ###
 
 # set mark for index/column duplicates
 constant $mark = '⋅'; # unicode Dot Operator U+22C5