Relax/remove the requirement that a Sumatra project is in a version controlled directory.

[apdavison]

Ghislain Picard asked on the mailing list:

"In addition, it seems also that sumatra really wants to be run from the main repo where the source are... It is quite unsual for the kind of model I'm using. Instead I have a dedicated "run" directory (in fact I have many). When using smt init -r path_to_versioned_source in such directory, smt fails because it tries to clone in the current directory which already contains data, param files, etc. As my repository is on y disk, does smt really need to clone it ?
"

[kwrobert]

I would like to second this. I love everything about sumatra, except the fact that every time I want to run simulations in a new place on my filesystem I have to clone my repo into that directory. It just introduces a lot of unnecessary clutter. All my source code usually sits in a single place, and I run simulations in different directories, mountpoints, etc. I don't need to clone the code into those directories.

If someone wants to point me to the relevant places in the source, I could take a shot at adding this.