Hang on startup with mpi-smp builds

[trquinn]

With recent versions (post 6.10.1) of charm++, changa can occasionally hang right at startup when run with an mpi-*-smp build.
This is a bug in recent versions of charm (see charmplusplus/charm#2850), but I'm putting it here so that people are aware of the work around: add +noisomalloc to the run command. isomalloc is a system that helps in porting new codes to charm++. ChaNGa does not need it, so turning it off avoids any issues. If you get the following warning:

Warning> Randomization of virtual memory (ASLR) is turned on in the kernel, thread migration may not work! Run 'echo 0 > /proc/sys/kernel/randomize_va_space' as root to disable it, or try running with '+isomalloc_sync'.

it is best to ignore it.