revised dot, big, int128

revised dispatch, sourceforge build script

improved pre-load, upgraded to AbstractTensors v0.6

transitioned to AbstractTensors v0.5

minor improvements and fixes

fixed convert issue for IJulia display

improvements for interoperability and dispatch

upgraded to revision 5129 with bug fixes

introduced @vars macro and incremented DirectSum version

fixed REPL print_response bug in Juila v1.2