cocytus update

Have the styxserver running, Basically used vacfs as the template for sending and receiving styx messages. Right now is basically just a skeleton for the file server. Am working now on implementing the various operations which will need to be performed on the venti side, i.e. this will be the mapping of the styx messages to the venti operations. Also the data structures invovled are being implemented as well, this step is being done before the operations. The vac and venti libraries contain some basic structures which will be used, but I will need to implement some things ot keep track fo the modified/unmodified states of the blocks.