fixed the tests for solve: the field ist only calculated upto a abitrary constant
added routine to multiply a vector with a variable and sum it to another vector multiplied with another variable in one step
created script to be used to start main: main.sh
calculated printed some statistics out put at lvl info
added CFLAGS -set to makefile opimised for performance
created getExternals.sh script to download the external sourcefiles to the source dir.
added routine to main to calculate large field with periodic borders
added routine to calculate the convergencerate for periodic borders
added routine to create random vector
modified solve to reduce number of scalar products
added parallelisation to the loops over all points