Review: MoreEnumerable.Subsets()

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Purpose of code changes on this branch:

Rev 117 - Implementation of a set of operators that produce a sequence of
subsets of an original source sequence. Subsets are produced in a deferred,
streaming manner. There are two primary overloads - one that produces all
subsets of a given sequence (of which there are 2^N), and an overload that
produces all k-sized subsets of a sequence (of which there are N!/((N-m)!m!)).

When reviewing my code changes, please focus on:

* The public interface of the extension methods.
* The effectiveness and clarity of the available XML comment documentation.
* How well these operators fit will into the MoreLINQ ecosystem of
extension methods.
* The extent of coverage available from the corresponding unit tests.
* The clarity and division of responsibility of the implementation.
* Whether edge cases are correctly identified and handled in the
implementation and tests.

After the review, I'll merge this branch into:
/trunk

Original issue reported on code.google.com by ambientl...@gmail.com on 17 Jan 2010 at 5:25

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Original comment by azizatif on 17 Jan 2010 at 11:22

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Now migrated to Hg and available in clone:
http://code.google.com/r/azizatif-morelinq-evenmore/
This clone is ready to be cloned :O) for further review. It also has the 
main/default branch already merged in to bring it up to date.

Original comment by azizatif on 25 May 2012 at 11:38

• Now blocked on: #37

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Original comment by azizatif on 11 Jun 2013 at 8:15

• Changed state: Started

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Following no response from ambientlion (who possibly/assuming lost interest 
given it has taken years to get this far), taking ownership of issue to 
consider as addition for MoreLINQ 2.0 milestone.

Original comment by azizatif on 12 Jun 2013 at 10:10

• Added labels: Component-Logic, Milestone-Release2.0, Priority-High, Type-Enhancement
• Removed labels: Priority-Medium, Type-Review

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This issue was closed by revision ecbb044b3f86.

Original comment by azizatif on 14 Jun 2013 at 5:18

• Changed state: Fixed