(infinite) homogenous sequences

[dkrenn]

Implement (infinite) homogenous sequences by using lazy lists.

CC: @mantepse

Component: misc

Branch/Commit: u/dkrenn/sequences/homogenous-seq @ 8354beb

Issue created by migration from https://trac.sagemath.org/ticket/19896

[dkrenn]

Branch: u/dkrenn/sequences/homogenous-seq

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

1136a64	fit start on iteration
8e4a562	add a doctest in dropwhile
a544d6d	correct nasty bug in takewhile (complete rewrite of method)
3b63c47	simplify `__repr__` code
8354beb	Merge branch 'extend_lazy_lists' into t/19896/sequences/homogenous-seq

[sagetrac-git]

Commit: 8354beb