Remove beta parameter from strategy

[kabicm]

Currently, beta parameter in strategy is of type double (thus not templated). However, there is no need for strategy to contain this parameter. Strategy has to be decoupled from the command line parser (options) and beta should be removed from strategy.

[kabicm]

Resolved in commit #97751914c43ba3044dda7a58c9a14efda38e7149

The beta parameter is now removed from the strategy. It was mostly used in the buffer class. However, it was only used as an indicator of whether additional reduce buffers are going to be allocated. To make it independent of the beta parameter, we set this value to 1, so that buffers will always allocate additional reduce buffer. This makes sense because for the same matrices the user might want to run different multiplications and the buffer class, as well as the matrix class, should be independent of beta.