This commit was manufactured by cvs2svn to create branch
'uBLAS_assignment_sematics'.

[SVN r29726]
Simple addative assignment for similar container


[SVN r29755]
merged
FIX Container concept requires erase_element


[SVN r29806]
merge HEAD


[SVN r29848]
Container types used throughout.
Concreate and abstract_tag dropped


[SVN r29859]
Vector/Matrix Expression concept not default contructable


[SVN r29860]
Merge from HEAD for testing


[SVN r29861]
scalar_expression too


[SVN r29862]
Allow for non default constructable proxies


[SVN r29864]
This commit was manufactured by cvs2svn to create branch
'uBLAS_assignment_sematics'.

[SVN r29866]
FIX const correctness of projections restored


[SVN r29902]
FIX previous const changes, return value and constructed projection must match


[SVN r29935]