remove ipi instructions (#41)

Author: tjjarvinen

README.md

@@ -12,50 +12,8 @@ At the moment this package only implements the high-level AtomsCalculators 0.2 i
 
 - Pair- and site potential building tools
 - Utility calculators
-- [i-PI](https://ipi-code.org) interface
 - Testing tools for calculators
 
 ## i-PI interface
 
-The interface is based on server and calculator, called driver, interaction.
-Server is setup by either network mode or unixsocket mode.
-
-Julia server can be started with
-
-```julia
-using AtomsCalculatorsUtilities.IPI
-
-# network mode on localhost 
-calc = IPIcalculator(ip"127.0.0.1"; port=33415)
-
-# unixsocket mode with socket at /tmp/ipi_mysocket
-calc = IPIcalculator("mysocket"; unixsocket=true,  basename="/tmp/ipi_")
-```
-
-Julia driver can be started with
-
-```julia
-using AtomsCalculatorsUtilities.IPI
-
-sys = # generate system that sets up atom types for the calculator
-calc = # generate a AtomsCalculators calculator
-
-# network mode on localhost 
-run_driver(ip"127.0.0.1", calc, sys; port=33415)
-
-# unixsocket mode with socket at /tmp/ipi_mysocket
-run_driver("mysocket", calc, sys; unixsocket=true,  basename="/tmp/ipi_")
-```
-
-Note, that you need to give driver AtomsBase structure that defines atom types.
-If you want to change either number or types of atoms, you need to create new driver.
-
-i-PI protocol requires values for energy, forces and virial.
-If you don't need virial or if your calculator does not support virial calculation,
-you can wrap your calculator to a utility calculator that returns zero virials
-
-```julia
-using AtomsCalculatorsUtilities.Calculators
-
-my_zero_vir_calc = ZeroVirialCalculator(mycalc)
-```
+i-PI interface has been moved to an own package at https://github.com/JuliaMolSim/IPICalculator.jl