doc/expression_concept.htm:
* splitted required methods into to const and non-const methods
* fixed minor typos
svn path=/trunk/libs/numeric/ublas/; revision=56006
CHANGE drop the template parameters of models, they are often incorrect, missleading and impossible to maintain
FIX Vector/ Matrix concepts have array_type and data() as special properties
svn path=/trunk/boost/libs/numeric/ublas/; revision=30110
- ALL proxy shortcuts are disabled by default as they cannot implement correctly type size_type and difference_type, range and slice
- projection free functions are also able to shortcut proxies of proxies
svn path=/trunk/boost/libs/numeric/ublas/; revision=30073
