New features in group algebra category

[vferay]

I added features in the category of group algebras (especially linked to the center).

Moreover, the symmetric group algebra now is a parent of this category.

Note : I have folded it with a previous patch on the same features, so look at the new version of the file (sorry, I should have worked on the same patch since the beginning)

Apply group_algebras_feature_central_vf.v2.patch

[wdj]

This patch failed to pply for me:

----------------------------------------------------------------------
| Sage Version 4.1.1.rc2, Release Date: 2009-08-06                   |
| Type notebook() for the GUI, and license() for information.        |
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**********************************************************************
*                                                                    *
* Warning: this is a prerelease version, and it may be unstable.     *
*                                                                    *
**********************************************************************
Loading Sage library. Current Mercurial branch is: gpalg
sage: hg_sage.apply("/Users/davidjoyner/sagefiles/grotrac_6647_permutationgroup_improvement.patch")
/Users/davidjoyner/sagefiles/group_algebras_feature_central_vf.patch
/Users/davidjoyner/sagefiles/groups
sage: hg_sage.apply("/Users/davidjoyner/sagefiles/group_algebras_feature_central_vf.patch")cd "/Users/davidjoyner/sagefiles/sage-4.1.1.rc2/devel/sage" && hg status
/Users/davidjoyner/sagefiles/sage-4.1.1.rc2/local/lib/python2.6/site-packages/sage/misc/hg.py:240: DeprecationWarning: os.popen3 is deprecated.  Use the subprocess module.
  x = os.popen3(s)
cd "/Users/davidjoyner/sagefiles/sage-4.1.1.rc2/devel/sage" && hg status
cd "/Users/davidjoyner/sagefiles/sage-4.1.1.rc2/devel/sage" && hg import   "/Users/davidjoyner/sagefiles/group_algebras_feature_central_vf.patch"
applying /Users/davidjoyner/sagefiles/group_algebras_feature_central_vf.patch
unable to find 'sage/categories/group_algebras.py' for patching
3 out of 3 hunks FAILED -- saving rejects to file sage/categories/group_algebras.py.rej
unable to find 'sage/categories/monoid_algebras.py' for patching
1 out of 1 hunks FAILED -- saving rejects to file sage/categories/monoid_algebras.py.rej
patching file sage/combinat/symmetric_group_algebra.py
Hunk #2 FAILED at 121
Hunk #3 FAILED at 131
Hunk #5 FAILED at 430
3 out of 5 hunks FAILED -- saving rejects to file sage/combinat/symmetric_group_algebra.py.rej
abort: patch failed to apply

DO you know what the problem is?

[vferay]

This patch must be applied after Nicolas Thiéry's patches on categories (I do not know which one exactly). So please do not use import to test it but apply it with qpush.

[chapoton]

Apply group_algebras_feature_central_vf.patch.new_version

[chapoton]

apply only group_algebras_feature_central_vf.v2.patch

[chapoton]

apply only group_algebras_feature_central_vf.v2.patch

[chapoton]

clean up of doc

[chapoton]

apply only group_algebras_feature_central_vf.v2.patch

[chapoton]

Given that the bot is happy, and that I have done my best to check the doc, I give a positive review.