[ESPResSo-devel] Overhauled the build system

[Olaf Lenz]

Hi everybody!

During the last days, I have done a lot of work on the build system. I
have not yet pushed the work to the master, but on the branch
"build-system" in my github repo, so that you can have a look at it
first. My repo is to be found at:

        https://address@hidden/olenz/espresso.git

I have done the following things:

* The automatic object directories "obj-XXX" have disappeared. This
should not affect most of you. If you are affected and feel that you
need it, please contact me!

* So far, "Espresso" was a shell-script that set the
environment-variable "ESPRESSO_SCRIPTS" and then called "Espresso_bin"
via MPI (if it knew how to). Now, "Espresso" is the binary itself, and
it has the path of ESPRESSO_SCRIPTS compiled into the binary, so that it
is not necessary to set the variable in the most cases. The binary will
still heed the variable if it is set, however. The binary does not know
how to handle MPI, this has to be done from the outside.

* The build process of the User's Guide has been modified, so that it
should work better now.

Cheers
  Olaf

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