Fixed manual for AROUND
Allow to configure with name of configuration file

One can know use e.g.
./configure mpi.linux.icc
to directly select the configuration and avoid interactive
choice. Better for building from script
Small change in regtest

It is possible to print html links to failed tests.
I am setting a nightly build and want to publish online
regtests results
Implemented OFile::rewind
Modified behavior of grid file in METAD

When not RESTARTing:
file is backed up if existing.
  with STORE_GRIDS, file grows during simulation
  without STORE_GRIDS, file is replaced every time grid is rewritten

When RESTARTing:
  with STORE_GRIDS, file is appended and grows during simulation
  without STORE_GRIDS, file is replaced every time grid is rewritten

This hopefully fixes #34
Regtest for WRITE_GRID
Added flush and some comment

Without STORE_GRIDS it is necessary to flush the grid file,
otherwise it might stay empty for the entire simulation
Merge branch 'v2.0' into v2.0-hrex