References #396

Closes #427

fixes #378

To distinguish between different kinds of config/data files, this commit
introduces two new settings, the "config directory" and the "webroot
directory". The split is meant to be implemented like this:
- files written by the dss should go into the 'data' directory
- files written by the users should go into the 'config' directory
- web server files should go into 'webroot' directory

WITH_CONFIG and WITH_WEBROOTDIR default to $WITH_DATADIR{,/webroot}

I'll need to rework the patch for upstream but it should work
for us.

  (cmake -DWITH_GCOV=on ..)
  Closes #84
* Included compiling with -Wold-style-cast
  but commented out since gsoap generates
  code that won't compile with that flag.
  Refs #125

Added lemonix toolchain file by Christoph Hofmann

"Fix build error for Debian and Ubuntu Systems"

Closes #57

  define is called WITH_DATADIR.
- Support for excluding test/simulation in CMake
- Catch filesystem exceptions in DSSim::LoadPlugins
- Don't overwrite the users config in Subsystems

Closes #24
Fixes #23, #11
References #10

- Use avahi for mDNS broadcasts if available

 * Added framework for configure checks with config.h
 * Added configure check for SpiderMonkey API header